That's a markup on price procedure.
Follow link to Casio Support.
Casio Support
SOURCE: Casio seem to have a problem with the percentage key
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.
SOURCE: how do I change the tax rate on my casio ms-10vc
Please try the following...
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!
How do I program tax rate into my calculator?
Non-printing models (also applies to HR-8TE printing calculator):
1. Press [AC]
2. Hold [SET/%] key for about 2 seconds
3. Press [TAX+]
4. Input the tax rate
5. Press [SET/%]
Printing models (except HR-8TE):
1. Have calculator in "print" mode
2. Press [CA]
3. Hold [SET/%] key for about 3 seconds
4. Input the tax rate
5. Press [TAX+]
6. Press [SET/%]
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