A farmer is concerned that the price of wheat will drop by the time he is ready to sell his crop. He, therefore, enters into a futures contract on 5,000 bushels of wheat for 250 cents per bushel. The exchange requires the farmer an initial margin of $3,000, with a maintenance margin of $2,000. a) What price change would lead to a margin call for the farmer? b) Under what circumstances could the farmer withdraw $1,500 from the margin account?