
Chris H. answered 10/26/15
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Bucknell Math Grad: Experienced Teacher and Tutor
Percent increase is defined as the amount of increase over the original amount expressed as a percent.
Amount of increase: 97.20 - 82.50 = 14.70
Original amount: 82.50
Increase / Original: 14.70 / 82.50 = 0.178181...
Express as a percentage: 0.178181... x 100 is approximately 17.82 % increase
You will likely want to round your answer as appropriate for a given question.