Initalized fine shows 0.00 can't enter price the only way to show a number is to press tax shift then numbers show but no decimal or ability to total

Here is the manual link

Press CTRL+F Type in 'tax' top right, press Enter. Scroll through the 19 mentions, Number 3 shows it. Copied and pasted below, but it doesn't show symbol image. The first paragraph covers getting into setting mode and setting date and time, then comes 'Tax Rate'.

https://www.manuallib.com/download//SHARP-EL-1801PIII-OPERATION-MANUAL.PDF

GT • RATE SET GRAND TOTAL / RATE SETTING MODE SELECTOR: "GT": Grand Total "•": Neutral "RATE SET": To set the date, time, and tax rate, set this switch at the "RATE SET" position. Date: • Enter in the order of month, day and year, then press to complete the entry. • Use to separate month, day, and year. • When is pressed, the number entered is evaluated and displayed as "date" if the value is within the following range; "Error" is displayed otherwise, and the previously set date is restored. Month: 1 - 12; day: 1 - 31; Year: 2000 - 2099 (in 4 digits) or 00 - 99 (in 2 digits) Time: • Enter in the order of hour, minutes, then press to complete the entry. (There is no entry available for the seconds value. The clock starts at zero second.) • If the hour/minute digit is less than 10, it is not necessary to enter the first digit "0". • Use to separate hour and minute values. • When is pressed, the number entered is evaluated and displayed as "time" if the value is within the following range; "Error" is displayed otherwise, and the previously set time is restored. Hour: 0 - 23 (24-hour system for the hour entry), Minute: 0 - 59

Tax rate: • Press three times, enter the tax rate, followed by . • A maximum of 4 digits can be stored (decimal point is not counted as a digit). • Only one rate can be stored. If you enter a new rate, the previous rate will be cleared.

more here and videos

https://www.google.com/search?q=sharp+el-1801piii+set+tax+rate
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In the product details of this calculator, it states that there is a "decimal point selector." This is normally a slider starting with the letter F followed by the numbers 0123 etc. It is probably on 0. You can set the number of decimals to whatever you want, or use F for full numbers. For example, if you set this to 2, you should always get 2 decimals.

Good luck,

Paul

If you mean it is not showing everything after the decimal point, you can change that by pressing the [f] key followed by the number of decimal places to display. For example, to restrict it to 2 places, press [f][2]. If you want to see 4 places, press [f][4].

To show all possible decimal places, use the sequence [f][9].
From the manual (http://www.hp.com/ctg/Manual/c00363319.pdf):
"To display a different number of decimal places, press f followed by a digit key (0 through 9) specifying the number of decimal places. In the following examples, notice how the displayed form of the number inside the calculator - 14.87456320 - is rounded to the specified number of digits."


"Although nine decimal places were
specified after f, only eight are
displayed since the display can
show a total of only 10 digits. "
The standard display format, plus the specified number of decimal places, remain in effect until you change them; they are not reset each time the calculator is turned on. However, if Continuous Memory is reset, when the calculator is next turned on numbers will be displayed in the standard display format with two decimal places
shown.
If a calculated answer is either too small or too large to be displayed in the standard display format, the display format automatically switches to scientific notation. The display returns to the standard display format for all numbers that can be displayed in that format.
http://www.hp.com/ctg/Manual/c00363319.pdf

Turn calculator On.
If you see no icons, press the Menu key.
Press 1 or use arrow keys to bring focus on RUN.
In Run scree press SHIFT MENU to enter SetUp
Use Arrow Down repeatedly till you reach the line Display.
Press the F1 key to select FIX
You can then specify the number of decimal digits to keep in your results, by pressing one of the function keys. You will be able to select 0 to 9 decimal digits.

Hide All
Percentages are calculated by using the following equation:
amount/total = percentage
Where percentage is in decimal format.
What do you want to do?

Calculate the amount if you know the total and percentage For example, if you purchase a computer for $800 and there is an 8.9% sales tax, how much do you have to pay for the sales tax? In this example, you want to find 8.9% of 800.
Example The example may be easier to understand if you copy it to a blank worksheet.

1. Create a blank workbook or worksheet.
2. Select the example in the Help topic. Note Do not select the row or column headers.
   Selecting an example from Help
3. Press CTRL+C.
4. In the worksheet, select cell A1, and press CTRL+V.
5. To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Formulas tab, in the Formula Auditing group, click the Show Formulas button.

1 2 A B Purchase price Sales tax (in decimal form) 800 0.089 Formula Description (Result) =A2*B2 Multiplies 800 by 0.089 to find the amount of sales tax to pay ($71.20) Note To convert a number in percentage format to a decimal, divide it by 100. For example, the sales tax in this example (8.9) divided by 100 is .089.
Calculate the percentage if you know the total and amount For example, if you score 42 points correctly out of 50, what is the percentage of correct answers?
Example The example may be easier to understand if you copy it to a blank worksheet.

1. Create a blank workbook or worksheet.
2. Select the example in the Help topic. Note Do not select the row or column headers.
   Selecting an example from Help
3. Press CTRL+C.
4. In the worksheet, select cell A1, and press CTRL+V.
5. To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Formulas tab, in the Formula Auditing group, click the Show Formulas button.

Simple way Amount/Total*100

1. Press the 2nd button.3
2. Press the Format button. (This is the second function on the . button).4
3. Enter the number of decimal places to show 0-9.5
4. Press the Enter button.

TI-5045 SV
ii
English.............................................................. 1
Fran?ais ............................................................ 6
Espa?ol ............................................................. 11
Portugu?s ........................................................... 16
Examples, exemples, ejemplos, exemplos .............................. 21
ILLUSTRATIONS ¦ FIGURES ¦ ILUSTRACIONES¦ ILUSTRA??ES
Removable tab
Languette
Leng?eta extracci?n
Alavanca usada para o rolo
Ink roller
Rouleau encreur
Tamp?n de tinta
Cartucho de tinta
1
English
Your Texas Instruments calculator has a built-in printer for producing a permanent record printout of
your calculations with negative numbers printed in red. A big, easy-to-read display also enables you to
check entries or perform quick calculations without printing.
GETTING STARTED
OFF ON PRT IC GT
POWER
1. Connect the calculator to a proper power outlet (110-120V or 220-240V
where available).
2. The calculator is turned on by setting the POWER switch to the PRT
position.
Inserting the paper (see illustrations 1, 2, 3, and 4 on page ii).
1. Turn on the calculator.
2. Open the printer compartment cover by pressing down on its front edge and sliding it back in the
direction of the arrow.
3. Fit the roll of paper on the holder so that it unrolls from the bottom, with the loose end toward the
calculator.
4. Cut the end of the paper squarely and insert it firmly into the printer slot on the back of the
calculator.
5. Press & until the paper is in the printing position.
Replacing the ink roller (see illustrations 5 and 6 on page ii)
1. Turn the calculator off and tear off the excess paper.
2. Remove the printer cover by pressing down on both sides of the front edge and sliding back in the
direction of the arrow.
3. Remove the old ink roller by lifting it with the removal tab.
4. Insert the new ink roller into the compartment and press down gently until it snaps into place. Close
the printer compartment.
Note: The old ink rollers should not be refilled. Replacement rollers can be obtained from your local
retailer. The warranty does not cover ink roller replacement.
2
SELECTION SWITCH SETTINGS
OFF ON PRT IC GT
POWER ROUND
: 5/4 9 + F 0 2 3
DECIMAL
4
TAX
SET CALC
Set the POWER, ROUND, DECIMAL and TAX switches as required.
Note: The TAX switch is spring-loaded to return to CALC when it is moved to SET and released.
The switch settings are summarized in the following table:
SWITCH SETTING FUNCTION
POWER ON
PRT
IC
GT
No printout is provided; however, the display can be printed by pressing
4.
The printer provides a printout of your calculations but does not count them.
The printer is on and an item count of additions and subtractions to or from
the register is printed when sub-totaled or totaled.
The GT position controls whether or not the totals from the independent add
register are accumulated in the grand total register.
ROUND Rounds the result of a calculation to the selected number of decimal places.
:
5/4
9
Truncates the result to the selected number of decimal places.
Rounds the result up or down according to its value. For example, when the
DECIMAL switch is set to 2, the result is rounded up if the third decimal
position is 5 or more and rounded down if it is 4 or less.
Rounds the result up to the selected number of decimal places.
Ex. 220 P 6
Setup: PRINTER: PRT, ROUND: :
DECIMAL: 2, TAX: CALC
Ex. 220 P 6
Setup: PRINTER: PRT, ROUND: 5/4
DECIMAL: 2, TAX: CALC
Press Display Printout Press Display Printout
2 0. 0¦ C
220 ' 220. 220¦ P
6 3 36.66 6¦ =
36¦66 ?
2 0. 0¦ C
220 ' 220. 220¦ P
6 3 36.67 6¦ =
36¦67 ?
DECIMAL + Add mode: All results are given with two decimal places. For addition and
subtraction only, a decimal point is automatically placed to the left of the last
two digits entered, unless the number already includes a decimal point.
F Floating mode: Any results are displayed and printed with the maximum
number of decimal places.
0 2 3 4 Fixed decimal mode: Sets the number of decimals to 0, 2, 3, or 4.
3
TAX SET
CALC
Lets you enter a tax rate to perform tax calculations.
Stores the tax rate. Pressing ! or " after a tax rate has been entered,
adds/subtracts the stored tax rate to/from the value in the display.
Ex. VAT = 17.5 %
100 + VAT
Ex. VAT = 17.5 %
235 - VAT
Setup: PRINTER: PRT, DECIMAL: F, ROUND: 5/4, TAX: CALC
Move and hold the TAX switch to SET. Press 217 L 5 and release the TAX switch. It
automatically returns to CALC. 17.5% is printed.
Press Display Printout Press Display Printout
2 0. 0¦ C
100! 117.5 100¦
17¦5 @
117¦5 ?
2 0. 0¦ C
235" 200. 235¦
N35¦ @
200¦ ?
Note: The most common setup is POWER: PRT, ROUND: 5/4, DECIMAL: 2, TAX: CALC. Use these
positions for the examples unless other settings are given.
KEY DESCRIPTIONS
Basic keys
I Clear Entry: Clears an entry, enabling you to enter another number in its place. Note
that this key does not clear the add register.
2 Clear Key: Clears the add register, any pending operations, and the display. 0.C is
printed. Does not clear the memory.
( Right Shift: Deletes the right-most digit entered from an entry before an operation key is
pressed. Shifts the remaining digits one place to the right.
L Decimal Point: Enters a decimal point.
4 Date/Non-Add: Prints a date (such as 12¦10¦96) or a number for reference purposes.
Does not affect calculations. This entry is printed on the left side of the printout, the date
or number preceded by the # sign.
& Paper Advance: Advances the printing paper.
Addition and subtraction keys
9 Add: Adds a number to the add register. Displays the cumulated result.
: Subtotal: Gives the intermediate total from the add register. Using this key does not
affect the contents of the add register.
. Subtract: Subtracts a number from the add register. Displays the cumulated result.
E Total: Gives the total from the add register, and then clears the register.
4
Multiplication, division, percent and margin keys
? Multiply: Multiplies the number in the display by the next value entered.
' Divide: Divides the number in the display by the next value entered.
3 Equals: Completes any pending multiplication or division operation.
> Percent: Calculates percentages, ratios, add-ons (e.g. of VAT), or discounts.
# Gross Profit Margin: Calculates the selling price of an item when its cost and gross
profit (or loss) margin are known; also used to obtain a price excluding VAT.
Ex.
Cost: 594
Profit margin: 40%
Press:2 594 # 40 3
Answer:
Selling price: 990
Gross profit: 396
Ex.
Selling price including VAT: 252
VAT %: 20%
Press: 252 # 20 . 3
Answer:
Selling price excluding VAT: 210
VAT: 42
/ Grand Total: Gives the grand total of the operations previously performed and stored in the
Grand Total register. Every time a total is obtained with E it is cumulated into this register
(printout shows G+) which is only cleared when / is pressed twice. During long
calculations, if / is not used, this re

To switch the radix point between the US and European modes, press and hold the decimal point key, press and release the ON key, then release the decimal point key.

Hello,
To convert from fractions to decimals, and from decimals to fractions use the [S<-->D] key. If you want your decimal results to have a fixed number of decimal places press [SHIFT][SETUP][6:Fix]. Screen shows Fix 0~9. Enter the number of decimal places exemple 3.
Dans ce cas 1/6 is displayes ase 0.167.
Hope it helps.

The Tax- function allows you to take the total cost (sub-total + tax) and it will subtract the tax and leave you with the sub-total (before tax).

Example:

If the item you have is $5 and the tax is set to 5%... when you use the Tax+ key it'll give you 5.25.

Conversely, when you enter 5.25 and press the Tax- key and it will give you the base price of $5.

So the Tax- key removes the tax from the total amount.
It doesn't remove the percentage OF the total amount.