Adam V. answered 11/28/16
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Professional Software Engineer, over 16 years work experience!
First, we need to calculate how much money was taken off the price.
40 - 25 = 15.
The question is asking the following:
"What percent of 40 is 15?"
40 * X = 15
x = 15/40
x = 0.375 = 37.5%
Therefore, a price of $25 is 37.5% off of an original price of $40.