please answer the following. will upvote once answered. thank you in advance!

(5) If the spot exchange rate between US dollar and Japanese Yen is $0.010 per Yen and the three-month forward rate is $0.011 per Yen, can you tell which country has higher interest rate, U.S. or Japan? (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