A grocer has 400 pounds of coffee in stock, 20 percent of which is decaffeinated. If the grocer buys another 100 pounds of coffee of which 60 percent is decaffeinated, what percent, by weight, of the grocer's stock of coffee is decaffeinated?



28%

30%

32%

34%

40%

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题目分析：

占比比例问题，先计算出 decaffeinated 的含量=400*20%+100*60%=140;现在的总的咖啡量=400+100=500; rate=140/500=28%.

综上：答案就是 A

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