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# Percenteg Function problem in my Casio MJ - 120 Model Calculator

Hi,
I have Casio, Japan make MJ - 120 Model calculator. Percentage functions are not working properly. For example: 200+20%=240. But my calculator shows 250, likewise 200-20%=160, but it shows 900. Please help me out.

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• Anonymous Apr 01, 2014

the calculator is not turning on. pls help

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I found it by myself, I can help you.
1. Press (AC)
2. Hold (Rate) for about 2-3 second
3. Press (Set / TAX+)
4. Input the tax rate
5. Press (Set / TAX+)
6. Hold (Rate) for about 2-3 second again
7. Press (Set / TAX+) again
And Then you can test the rate .

From Thailand

Posted on Oct 19, 2009

• Noklek Oct 19, 2009

Sorry, I mean to the solution for set tax rate with casio mj-120t .

• satyapogula Apr 22, 2011

i have been looking for this for long. thanks!. It worked perfectly on MJ - 120T. how to use the 'MU' and 'GT' keys. can i get examples for use of M+ , M- and MRC. How best i can use them.

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How to turn off MJ-120T calcutor

Posted on Apr 02, 2011

• Andrew Tate Nov 12, 2014

Only has auto off. Displays CASIO on the screen just before it turns off. No OFF key.

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For Calculating percatnge and then adding it to the principal you ought sequence the keys for your above example, in the following manner:

Key in 200 : Display shows 200
Press X : Display shows 200 *
Key in 20 : Display shows 20
Press % : Display shows 40
Press + : Display shows 240

Similarly for the later part of example,

Key in 200 : Display shows 200
Press X : Display shows 200 *
Key in 20 : Display shows 20
Press % : Display shows 40
Press - : Display shows 160

So, first multiply, with the value of %, then instruct the calcy that the value was a % value & then deduct or add to the principal as desired.

Posted on Nov 30, 2009

• satyapogula Apr 22, 2011

You have to press '=' key to get the displayof 240 160 as in parampal's steps in MJ120T.

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How do I set tax rate in casio mj-120t

Posted on Aug 21, 2009

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• pitk Aug 21, 2009

I think the software in your casio is corrupted. return it to the dealer and get a new one.

• Andrew Tate Nov 12, 2014

Look for a key with "RATE SET" printed above it and press and HOLD that for about 3sec then type in the tax rate using number keys. Then press RATE SET key again.

• Andrew Tate Nov 12, 2014

On my Casio MJ-120TG it is the % key which has this dual function.

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Please suggest me whats the solution
Key in 200 : Display shows 200
Press X : Display shows 200 *
Key in 20 : Display shows 20
Press % : Display shows 40
Press + : Display shows 40 Instead of 240

Posted on Sep 03, 2016

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In answer to original question. I get your answer on my MJ-120T if I type 2 0 0 MU 2 0 % in other words what price do I sell at in order to have 20% mark up when buying for 200. Answer 250 as the mark up is on the final price (20% of 250 is 50 so correct).
To simply add 20% to a value key the following>>
2 0 0 + 2 0 % to display 240.
Or like this to see the intermediate percentage calculation>>
2 0 0 x 2 0 % to display 40 and then + = to display 240.

Or on the MJ-120 you can set your TAX rate to 20 and just use the TAX+ and TAX- keys this model has these dedicated keys.

Posted on Nov 12, 2014

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I bought a Casio Fx-991ES. Few days ago i noticed that my display line is inverted. I dnt know what function i pressed. Please help me... For Example.... Before when i press 5 it shows in 1st line... Bt nw its in 2nd line and its inverted 5
How can i fix my problem?

Posted on Nov 20, 2013

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Posted on Jan 02, 2017

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