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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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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

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
Goodluck!

Posted on Jan 02, 2017

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