please help with part c!!!!

You have a margin account set up at Fidelity where the initial margin for all transactions is set at 50%. The interest rate on loans (money borrowed) is 8%. Your transactions are as follows: You buy 100 shares of Apple at $220 (Apple pays an annual dividend of $3.00 a share) You short 200 shares of Exxon at $80 (Exxon pays an annual dividend of $4.00 a share) In 1 year Apple's stock rises to $250 and Exxon's stock drops to $60. a) What is the rate of return for your account? b) Calculate the equity in your account in 1 year showing your assets and liabilities in detail c) Calculate at what price you will receive a margin call for Apple (calculate as of right now the time of purchase for your calculation assume the price of Exxon remains at $80). Assume the MMR is 20%. Note you cannot use a formula for this you need to use 20% - Equity / Market value of Positions Ignore commissions and cost of borrowing shares - also sale proceeds from short sale cannot be used to purchase additional stock. when you buy stock still need to borrow money (loan). Hint: For a and b you can treat the transactions like they are in 2 separate accounts if you like - you just need to combine things to get the correct answer. For the answer is not $137.50 at that price the equity as % of market value of positions is above 35%