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 dollars , what is the final price of the backpack before taxes?

A 70% discount leaves 30% of the original price: $55 × 0.30 = $16.50. The additional 10% discount is taken off that sale price, so Yuto pays 90% of $16.50: $16.50 × 0.90 = $14.85. The final price is $14.85, choice C.

AI-written and checked against the verified answer.