8- Macro Inc. opens a brokerage account and purchases 300 shares at $40 per share. It borrows $4,000 from a broker to help pay for the purchase at an interest rate of 8% on the loan. a) What is the margin in Macro Inc.'s account when they first purchased the stock? b) If the share price falls to $30 per share by the end of the year, what is the remaining margin in the account? If the maintenance margin requirement is 30%, will Macro receive a margin call? c) What is the rate of return on this investment