2005 AMC 10B 第 1 题

Question

一个童子军小队以每五根

\$2

的价格买了

1000

根糖果棒。他们又以每两根

\$1

的价格把所有糖果棒卖出。他们的利润是多少美元？

A scout troop buys

1000

candy bars at a price of five for

\$2.

They sell all the candy bars at a price of two for

\$1.

What was their profit, in dollars?

100

200

300

400

500

分别求总成本和总收入。

Find the total cost and the total revenue separately

糖果棒可分成

200

组五根，或

500

组两根。

The bars come in

200

groups of five and

500

pairs

小队购买

1000 \div 5 = 200

组五根糖果棒，花费

200 \cdot 2 = 400

美元。

他们卖出

1000 \div 2 = 500

组两根糖果棒，收入

500 \cdot 1 = 500

美元。

利润为

\$500 - \$400 = \$100

。

所以正确答案是 A。

The troop buys

1000 \div 5 = 200

groups of five bars, costing

200 \cdot 2 = 400

dollars.

They sell

1000 \div 2 = 500

pairs of bars, earning

500 \cdot 1 = 500

dollars.

The profit is

\$500 - \$400 = \$100.

Thus, A is the correct answer.

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