GMAT
题目
A company manufactures 10,000 bulbs at a cost of $$0.6$ each. Out of these bulbs, $0.1%$ were discarded and each of the remaining bulbs was sold at $\$ 1.1$. What is the difference between the revenue and the manufacturing cost for the company?
解析
收入 = 每个灯泡的售价 × 灯泡数量
100 - 0.1 = 99.9\%
因此我们需要计算 10000 个灯泡的 99.9%：
10000 × 99.9/100 = 9990
收入变化为：
9990 × 1.1 - 10000 × 0.6 = 4989
所以选项 B 是正确答案。
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