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Suppose Brian is in the market for a used textbook and the campus bookstore is having a sale. If the initial price of the used book is $81 and the discounted price is $66, what is the percentage chang
Suppose Brian is in the market for a used textbook and the campus bookstore is having a sale. If the initial price of the used book is $81 and the discounted price is $66, what is the percentage change in the book price? Round your answer to two places after the decimal