A scout troop buys 1000 candy bars at a price of five for $2. They sell all the candy bars at a price of two for $1. What was their profit, in dollars?<spanclass=′latex−bold′>(A)</span>100<spanclass=′latex−bold′>(B)</span>200<spanclass=′latex−bold′>(C)</span>300<spanclass=′latex−bold′>(D)</span>400<spanclass=′latex−bold′>(E)</span>500