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?A2/20B19/21C21/19D18/20E20/18

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.

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