SOLUTION: Mary got 8/10 on her test. With what percentage increase could her test have been at least a 90?

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Question 1071606: Mary got 8/10 on her test. With what percentage increase could her test have been at least a 90?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
She got an 80% on her test, so to go from 80% to 90% would require a percentage increase of,
%28%2890-80%29%2F80%29%2A100=1000%2F80=12.5
She needed a 12.5% increase.