AMC 8 2019 Problem 22

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$?$ $\textbf{(A) }16 \textbf{(B) }20 \textbf{(C) }28 \textbf{(D) }36 \textbf{(E) }40$