Yuto found a backpack on sale for 70 percent off. He used a coupon for an additional 10 percent off. If the original price of the backpack was $55, what is the final price of the backpack before taxes?

A 70% discount means Yuto pays 30% of the original price: $55 × 0.30 = $16.50. The additional 10% coupon reduces that sale price by 10%, so he pays 90% of $16.50: $16.50 × 0.90 = $14.85. The final price is $14.85, choice B.

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