SP&P closes at 2250
Buyer : $250 x 2200.80 = $550,200
Seller : $250 x 2250 = $562,500
Seller pays buyer $12,300
I made a profit of $12,300
Currently, the initial margin requirement for an S&P futures contract is $28,125, and the maintenance margin requirement is $22,500.
Given the profit you found in part c, calculate your percentage profit on the trade, given what you had invested (the initial margin requirement).