选择题
2019 AMC 8 Problem 22: Price Change Percent
A store increased the original price of a shirt by a certain percent and then lowered the new price by the same amount. Given that the resulting price was 84% of the original price, by what percent was the price increased and decreased?
2019 AMC 8 第 22 题：价格变化百分比
一家商店将衬衫的原价提高了一定的百分比，然后将新价格降低了相同的百分比。鉴于最终价格为原价的 84%，价格上涨和下跌的百分比是多少
A.
16
B.
20
C.
28
D.
36
E.
40