# 20 Most Recent Casio MS-80TV Scientific Calculator Questions & Answers

Press AC twice. Hold down % set key for about 2 seconds until ?0? disappears on screen, then reappears. Press Tax Rate key. Input tax rate (12.5%) and press % set key. If this does not work, search for your model number here on Fixya and you will find other solutions posted. Good Luck!

Casio MS-80TV... | Answered on Feb 19, 2018

To set the BD-9512 (Staples Big Digit Tax Calculator)
1. Press ON/AC
2. Press and HOLD the RATE button (for 2 sec)
3. Enter desired Tax amount (i.e.: enter only 13 for 13%)
4. Press TAX + (or TAX - if setting the minus button)
5. Press RATE to save it.
Violia!

Casio MS-80TV... | Answered on Jun 12, 2017

The issue is the fact that you are adding the %. You need to Multiply it by 1.1 instead of trying to add 10%. This is a wonky equation anyway, because your not specifying what you want to add 10% of. This is why you are getting a weird answer.

Casio MS-80TV... | Answered on Aug 01, 2014

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.

Casio MS-80TV... | Answered on Jul 18, 2014

Turn the calculator over. Look for some small screws that fasten a 1 or cover to the body of the calculator. Loosen the screws and remove cover. You should find button cell batteries. Before removing them make a note of the sign you see on the batteries (+ or -) while they still in place. Replace the batteries with the same model or equivalent ones. Replace the cover.
For more detailed instructions consult your calculator's manual.

Casio MS-80TV... | Answered on Jan 25, 2014

they call it hardware malfunction. try removing all batteries in it and wait for 30 seconds before reinserting the batteries. If the same problem still exist, the unit is permanently damaged.

Casio MS-80TV... | Answered on Nov 27, 2013

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