2. 外语
  3. Over a three-week period, the price of an ounce of gold increased by 25% in the first week, decreased by 20% in the following we

Over a three-week period, the price of an ounce of gold increased by 25% in the first week, decreased by 20% in the following we

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问题 Over a three-week period, the price of an ounce of gold increased by 25% in the first week, decreased by 20% in the following week, and increased by 5% in the third week. If the price of gold was G dollars per ounce at the beginning of the three weeks, what was the price, in terms of G, at the end of the three weeks?
选项 A、0.95G
B、G
C、1.05G
D、1.1G
E、1.15G
答案C
解析 At the end of the first week, the price was 1.25×G= 1.25G. At the end of the second week, it was 0.8×1.25G= G. At the end of the third week, the price was 1.05×G = 1.05 G.
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