A store increased the original price of a shirt by a certain percent and then decreased the new price by the same percent. Given that the resulting price was 84% of the original price, by what percent was the price increased and decreased?<spanclass=′latex−bold′>(A)</span>16<spanclass=′latex−bold′>(B)</span>20<spanclass=′latex−bold′>(C)</span>28<spanclass=′latex−bold′>(D)</span>36<spanclass=′latex−bold′>(E)</span>40