AMC12 2006 B

AMC12 2006 B · Q4

AMC12 2006 B · Q4. It mainly tests Percent, Rounding & estimation.

Mary is about to pay for five items at the grocery store. The prices of the items are $7.99$, $4.99$, $2.99$, $1.99$, and $0.99$. Mary will pay with a twenty-dollar bill. Which of the following is closest to the percentage of the $20.00$ that she will receive in change?

Mary 在杂货店准备购买五件商品。商品价格分别为 $7.99$、$4.99$、$2.99$、$1.99$ 和 $0.99$。Mary 将用一张二十美元钞票付款。下列哪一项最接近她将收到的找零占 $20.00$ 的百分比？

(A) 5 5

(B) 10 10

(D) 20 20

(E) 25 25

Answer

Correct choice: (A)

正确答案：（A）

Solution

The total price of the items is $(8-.01)+(5-.01)+(3-.01)+(2-.01)+(1-.01)=19-.05=18.95$ $20-18.95=1.05$ $\frac{1.05}{20}=.0525 \Rightarrow \text{(A)}$

商品总价为 $(8-.01)+(5-.01)+(3-.01)+(2-.01)+(1-.01)=19-.05=18.95$ $20-18.95=1.05$ $\frac{1.05}{20}=.0525 \Rightarrow \text{(A)}$

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