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In Problems 60–65, find the percent increase or decrease. The percent increase or percent decrease is defined as:
61. Gas Mileage The gas mileage on your van decreases due to the heavy weight of extra passengers and a boat on a trailer. With the extra weight your van gets 15 mpg, and without the weight it gets 21 mpg. To the nearest tenth, what is your percent decrease in gas mileage with extra weight?
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