GMAT
题目
Orhan's blood glucose level decreased by p% during the first week of therapy. After two weeks, his blood glucose level was 4p% lower than its initial value. By what percent did his blood glucose level decrease during the second week?
解析
设Orhan在第1周开始时的血糖值为 100。
第1周后：\(100-p\)
第2周后：\(100-4p\)
第1周到第2周的**变化百分比**：
\[
\% \text{ change} = \frac{(100-p)-(100-4p)}{100-p} \times 100
= \frac{3p}{100-p} \times 100
= \frac{300p}{100-p}
\]
因此答案为（D）。
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