A trader takes a long position in two January gold futures contracts when the futures price is $2,000 per ounce on Day 1. The contract size is 100 ounces per contract The trader's broker requires the trader to deposit $10,000 per contract as the initial margin. The maintenance margin is 75% of the initial margin. Suppose that the trader holds this position until he sells the two contracts on Day 13 at a price of $1,976.20. The trader deposits the variation margin the next trading day, in the case of a margin call by the broker. The settlement prices of the contract while the investor holds the position are listed under the Settlement Price column at the table below. Based on the given information, fill in the Daily Gain, Cumulative Gain, Margin Account Balance and Margin Call (if any) columns of the table .

please explain the calculation together with

DAY	TRADE PRICE	SETTLEMENT PRICE	DAILY GAIN	CUMULATIVE GAIN	MARGIN ACCOUNT BALANCE	MARGIN CALL
1	2,000.00	-	-	-
1	-	1,991.00
2	-	1,988.30
3	-	1,994.60
4	-	1,991.10
5	-	1,990.10
6	-	1,986.20
7	-	1,979.00
8	-	1,980.80
9	-	1,975.40
10	-	1,978.10
11	-	1,962.50
12		1,964.30
13	1,976.90	-