7. You are bearish on Tesla. You short sell 200 shares of Tesla stock at the market price. (a) If your broker's initial margin requirement is 50% of the value of the short position, how much in cash or securities must you put into your brokerage account? (b) If the maintenance margin requirement is 30% of the value of the short position, how high can the price of Tesla stock rise before you get a margin call? (c) Suppose also that at the time you close your short position in Tesla in a year, its price is at $900 per share. What is your holding period return of this particular short sale? (Assuming that you never get a margin call during that time period.)