Kathy V. answered 04/03/15
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Percent of change formula is (newPrice - oldPrice) / oldPrice, or more simply, amountOfIncrease / oldPrice. The answer will be a decimal (or how many hundredths). To change to a percent, multiply the answer by 100.
The formula will also work for percent decrease, by the way.
Try to calculate this and see if your answer is 15%.
Steps:
How much is the increase in dollars?
What is the old (or original) price?
Divide the two previous answers.
Multiply by 100 to change to a percent.