De Trader opens a brokerage account and purchases 100 shares of Internet Dreams at $52 per share. She borrows $2,800 from her broker to help pay for the purchase. The interest rate on the loan is 7%.

Required: a. What is the margin in Des account when she first purchases the stock? b. If the share price falls to $42 per share by the end of the year, what is the remaining margin in her account? c. If the maintenance margin requirement is 30%, will she receive a margin call? d. What is the rate of return on her investment? (Negative value should be indicated by a minus sign. Round your answer to 2 decimal places.)