De Trader opens a brokerage account and purchases 400 shares of Internet Dreams at $20 per share. She borrows $2,500 from her broker to help pay for the purchase. The interest rate on the loan is 7%. a. What is the margin in De's account when she first purchases the stock? Margin b. If the share price falls to $10 per share by the end of the year, what is the remaining margin in her account? (Round your answer to 2 decimal places.) Remaining margin % c. If the maintenance margin requirement is 30%, will she receive a margin call? O Yes O No 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.) Rate of return