Each time a bar of soap is used, its volume decreases by 10%.
What is the minimum number of times
a new bar would have to be used so that less than one-half its volume remains?<spanclass=′latex−bold′>(A)</span>5<spanclass=′latex−bold′>(B)</span>6<spanclass=′latex−bold′>(C)</span>7<spanclass=′latex−bold′>(D)</span>8<spanclass=′latex−bold′>(E)</span>9