2. 外语
  3. A store bought 5 dozen lamps at ＄30 per dozen and sold them all at ＄15 per lamp．The profit on each lamp was what percent of its

A store bought 5 dozen lamps at ＄30 per dozen and sold them all at ＄15 per lamp．The profit on each lamp was what percent of its

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问题 A store bought 5 dozen lamps at ＄30 per dozen and sold them all at ＄15 per lamp．The profit on each lamp was what percent of its selling price?
选项 A、20％
B、50％
C、
D、100％
E、500％
答案C
解析 For this problem it is especially important to keep your focus on what is asked and to ignore extraneous details.
The cost per lamp is $30/dozen=$30/12 and the selling price per lamp is $15, so the profit per lamp is $ (15-30/12). Therefore, for each lamp the profit as a percent of the selling price is
The correct answer is C.
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