1. you wish to buy a stock on margin. If you have $7500 in your purse to invest and the initial margin requirement is 50%. The maintenance margin is 40%. IBM is selling for $150 per share now. (1) how much you can borrow if you want to buy as many IBM shares as you possibly can? Also show me the initial balance sheet. (2) After your purchase, one year later, IBM falls to $120 per share. Do you subject to a market call when IBM falls to $120 per share one year later? Why? Show me how to get the new margin. (3)At what price are you subject to a margin call