Answer:
No of stock = 1100
Price of Stock = 29
Short sale = 31900
Initial Margin % = 55%
Initial Margin = 17545
Total value = 49445
The earnings of the sale is 31900, which is deposited in our account for a total account value of $49,445 (31900+55%)
Maintenance Margin = 40%
Margin Call Value = 49445/ (1+0.4)
Margin Call Value = 35317.86
Price per share = 35317.86 / 1100
Price per share = 32.11
So a margin call will be triggered when the price of the shorted security rises to $32.11
Margin Call Price = 32.11
Account Equity = 32.11*1100
Account Equity = 35318