money questions maths

It is a question of mathematics, is money?.
If someone had said $ 100.00 I'll give you 10% of $ 100.00, How can I get? I also know that the same problem with $ 5000.00, representing 10% of $ 5000.00 How do I do this in a calculator? What I type in a calculator to solve 10% of any sum of money?
— 100 x .10 = 10 5000 x .10 = 500 simply type the amount is then multiplied by the percentage divided by 100
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