2005 AMC 10B Problem 1

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 the profit, in dollars?

\mathrm{(A)} 100 \qquad \mathrm{(B)} 200 \qquad \mathrm{(C)} 300 \qquad \mathrm{(D)} 400 \qquad \mathrm{(E)} 500

Full credit goes to MAA for authoring these problems. These problems were taken on the AOPS website.