Skip to content / Đến nội dung
ThichHocToan.com

2010 AMC 10B Question 11

AMC10 · 2010 AMC 10B

Question 11

A shopper plans to purchase an item that has a listed price greater than $\$100$ and can use any one of the three coupons. Coupon A gives $15\%$ off the listed price, Coupon B gives $\$30$ off the listed price, and Coupon C gives $25\%$ off the amount by which the listed price exceeds $\$100.$

Let $x$ and $y$ be the smallest and largest prices, respectively, for which Coupon A saves at least as many dollars as Coupon B or C. What is $y - x?$
  1. $50$
  2. $60$
  3. $75$
  4. $80$
  5. $100$