9. (10 pts) You are bearish on Uber and decide to sell short 100 shares at the current market price of $50 per share. a) How much in cash or securities must you put into your brokerage account if the broker's initial margin requirement is 50% of the value of the short position? b) How high can the price of the stock go before you get a margin call if the maintenance margin is 30% of the value of the short position