Suppose that on Day 0, you take a long position in a futures contract on copper maturing on Day 3. Each contract is on 2,000 kilograms of copper, with the closing futures price on Day 0 equal to per kilogram. Suppose the closing futures prices on Day 1, 2, and 3 are and , , respectively. The futures contract is marked to market daily, at the end of the trading day, with resulting gains and losses settled using a margin account.