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单选题
At the beginning of the day, the prices of stocks X and Y are the same. At the end of the day, the price of stock X has increased by 1/20 of its original price and the price of stock Y has decreased by 1/20 of its original price. The new price of stock X is what fraction of the new price of stock Y?
A
2/20
B
19/21
C
21/19
D
18/20
E
20/18
参考答案
参考解析
解析：
Plugging in. Suppose the prices of stocks X and Y were each $100 at the beginning of the day. Then：The new price of stock X is $105. The new price of stock Y is $95. stock X/stock Y =l05/95= 21/19.
Plugging in. Suppose the prices of stocks X and Y were each $100 at the beginning of the day. Then：The new price of stock X is $105. The new price of stock Y is $95. stock X/stock Y =l05/95= 21/19.
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