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You are a speculator in crude oil futures. You enter a long position in one crude oil futures contract at a price of $ 47.23 per barrel. Your initial margin is $6, 000 per contract, and your maintenance margin is $4, 500 per contract. Each contract is for 1, 000 barrels. Later in the month, the settlement price drops to $ 45.61 per barrel. What is your variation margin if your account is marked to margin at this price? ($1, 620)