I to have the same problem and have contacted Casio and awaiting an answer I type in 10+10% to get 11.1111 on the MS-7TV this is not correct. I also tryed it on other Casio calculators to get a similar problem. I thought it may be linked to the tax rate calcuation but when I changed this I get the same answer.
I get a correct answer from alternate brands of calculators.
From CASIO FAQS:
Why do I get the wrong answer when doing a percent calculation?
Make sure that you are following the correct procedure.
Adding 10%: 200 [x] 10 [%] [+]
Subtract 10%: 200 [x] 10 [%] [-]
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.
In my calculator the percentage key used to work but now when I press it nothing happens
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