I have done this
At the end of first day balance 5000= ( 17.5-17) *10000
Margin balance would be 6400- 5000= 1400.
At the end of second day the margin balnce (16.9-17)*10000= 1000
So the margin balance would be (1400-1000)= 400 but here anser is given as option c which is 6800 I am not abel to understand
10,000 ounces means 2 contract of 5,000 ounces each, so intial margin will be 12,800. Maintenance margin= 6,000.
Loss on first day= 5,000
Loss on second day= 1,000
Margin account balance= 6800