need ASAP! please solve the following w/explanation. will upvote once answered thank you in advance MVP!

(6) An investor enters into two long July futures contracts on orange juice in February. Each contract is for the delivery of 15,000 pounds. The current futures price is 160 cents per pound. The initial margin is $6,000 per contract, and the maintenance margin is $4,500 per contract. What price changes would lead to a margin call? (1) What are the differences in counterparty default risks between forward and futures contracts? (2) Consider the forward and futures contracts on the same underlying asset and having the same maturity. Under what circumstances can forward price and futures price be different