A trader sells five futures contracts on gold. The current futures price is $1600 per ounce. Each contract is for the delivery of 100 ounces. The initial margin is $10,000 per contract and the maintenance margin is $7,000 per contract. What price change would lead to a margin call? Under what circumstances could $2,500 be withdrawn from the margin account?

Hint: You can withdraw funds from the margin account if the total balance is higher than the initial margin, given that the balance remains at or above the initial margin.