2. 外语
  3. In 1980, the cost ofp pounds of potatoes was d dollars. In 1990, the cost of 2p pounds of potatoes was d/2 dollars. By what perc

In 1980, the cost ofp pounds of potatoes was d dollars. In 1990, the cost of 2p pounds of potatoes was d/2 dollars. By what perc

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问题 In 1980, the cost ofp pounds of potatoes was d dollars. In 1990, the cost of 2p pounds of potatoes was d/2 dollars. By what percent did the price of potatoes decrease from 1980 to 1990?
选项 A、25%
B、50%
C、75%
D、100%
E、400%
答案C
解析
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