You are bullish on X Corp stock. The current stock price is $50 per share. You have $35,000 of your own, and you borrow an additional $25,000 from your broker. 

1.  How many shares did you buy? 

 2. How far can the stock price fall before your receive a margin call if the maintenance margin is 40%? 

3.  After receiving a margin call, how much additional cash do you need to put in your account to restore the 50% initial margin requirement? 

4.  Assume that you hold the position for a year and pay 5% interest on the loan. What is your rate of return from this investment when the stock price increases to $80 per share?