Write a program that takes two values from the keyboard, the first one is the amount of a bill, the second one is the percentage that is used to compute the tip to be added to the bill. There is a catch though: we want to make sure that the percentage is between 10% and 100%. If any other value is entered, the request percentage is repeated, until a valid value appears. Once that happened, the program outputs the tip amound and terminates.

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