The closing price of Stock ~$X$~ changed on each trading day last month. The percent change in the closing price of Stock ~$X$~ from the first trading day last month to each of the other trading days last month was less than 50 percent. If the closing price on the second trading day last month was $10.00, which of the following CANNOT be the closing price on the last trading day last month?
$3.00
$9.00
$19.00
$24.00
$29.00
接着根据这个变动不超过50%的规律求出最后一天的closing price
当这个change是第一天的增加50%才是最后一天的closing price
所以:最后一天closing price最大值为:20(1+50%)=30
当这个change是第一天的减少50%才是最后一天的closing price
所以:最后一天closing price最小值为:6.67(1-50%)=3.34
因此最后一天的closing price范围是(3.34,30)
A选项3不在这个范围。错误。
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