求助一道数学

dl7801

the price per share of stock x increased by 10% over the same time period that the price per share of stock y decreased by 10%. the reduced price per share of stock y was what percent of the original price per share of stock x?

1. the increased price per share of stock x was equal to the original price per share of stock y
2. the increse in the price per share of stock x was 10/11

answer: D
my answer: A

条件2并没有涉及到Stock y呀？
来自新东方模考软件

猫猫头

你的条件2有没有问题啊？？

dl7801

没问题，我原样抄下来的，刚才又对照了一遍。

tongxun

A 吧，条件2）只能推出X股票原价和现价是多少，但由于没有Y的任何信息和关联，所以推不出X与Y的具体关系。