Answer:
72 cents
Explanation:
There is going to be a margin call when greater than 1000 dollars has been lost from the margin. Then the balance in the account is going to be smaller than that of the maintenance margin. so 1 cent increase in the price would bring about a lossof
0.01 * 50000
= $500
if the increase in the future price is about 2 cents then there would be a margin call.
70+2 = 72cents, this is when there would be a margin call