Jin buys 200 shares of a stock at $40 per share in his margin account. Refer to the margin requirements below to answer the following questions. (Assume that he incurs no additional costs.) i (Click the icon to view the margin requirements on long positions.) a. What is his margin requirement in dollars? b. What is his return on investment if the stock price rises to $50 per share and he sells his shares? c. If the stock price decreases to $20 and Jin decides to sell the stock, what is his return on investment? What is the most amount of money that he could lose on this investment