A section of books is marked down by 15 percent from an original price of 16 dollars each. How much will it cost to buy three books from the sale section?

A 15% discount on $16 is $2.40, since 0.15 × 16 = 2.40. Each book therefore costs $16 − $2.40 = $13.60. Three books cost 3 × $13.60 = $40.80, which is choice A, 40.80 dollars.

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