Trader has opening a Long position in oat futures contract at 189 cents / bushel at the close of day 0. The initial margin is USD 1400while required margin is USD 1050. At the end of day 1 the futures contract is being closed at 185 cents/bushel. At the end of Day 2 the futures contract is being closed at 181cents/bushel. Please establish the value of margin at day 1 and day 2 and calculate variation