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Hi, this is a mathematical question, but I'm doing it in VB so I thought I'd post it here...

A person is shown a total of 10 numbers. When a number appears on the screen they have to type that number into a text box and if they get it correct another number appears. If they do not get it correct they get another chance at getting the original number correct.

I'm trying to work out the accuracy of the values they input (and then I display that accuracy as a percentage when the program has finished.) For example, if they input 11 values (i.e. 1 of them is not the correct number) then I'm guessing the accuracy is approximately 90%. But what is the formula to obtain this figure/percentage?

Thanks.