Please answer and show work for the second part of this question (Under what circumstances could $2,000 be withdrawn from the margin account?)

An orange farmer sells two July futures contracts on orange juice. Each contract is for the delivery of 15,000 pounds. The current futures price is 120 cents per pound, the initial margin is $6,000 per contract, and the maintenance margin is $4,500 per contract. What price change would lead to a margin call? Under what circumstances could $2,000 be withdrawn from the margin account