1993 AMC 12 第 5 题

Question

去年，一辆自行车售价

\$160

，一个自行车头盔售价

\$40

。今年，自行车价格上涨了

5\%

，头盔价格上涨了

10\%

。自行车与头盔的总价上涨了百分之多少？

Last year a bicycle cost

\$160

and a cycling helmet cost

\$40.

This year the cost of the bicycle increased by

5\%,

and the cost of the helmet increased by

10\%.

The percent increase in the combined cost of the bicycle and the helmet is

6\%

7\%

7.5\%

8\%

15\%

分别求出两件商品上涨的金额。

Find the dollar increase for each item

将总上涨金额与去年的总价比较。

Compare the total increase with last year’s combined cost

自行车涨价

\$8

，头盔涨价

\$4

，总计涨价

\$12

。去年的总价为

\$200

，所以涨幅为

\frac{12}{200}\cdot100\%=6\%\text{。}

因此正确答案是 A。

The bicycle increases by

\$8

and the helmet by

\$4,

for a total increase of

\$12.

Last year’s combined cost was

\$200,

so the percent increase is

\frac{12}{200}\cdot100\%=6\%.

Thus the correct answer is A.

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