Stock transactions: Margin trading

Suppose Caroline wants to purchase $100$ shares of Hydroflex stock at $$50$ per share through Georgia Brokerage. The value of the shares is $$

If Caroline does not have enough funding to purchase the shares herself, and Georgla Brokerage requires an initial margin of at least $60$ percent, Caroline's initial equity investment would need to be at least $$ in order for Georgia Brokerage to lend her the funds. If Caroline invests this amount, then Georgia Brokerage would cover the remaining $$

If the price of Hydroflex's decreases to $$40$ per share, then the total value of Caroline's shares is now $$ As a result, Caroline still owes the brokerage firm $,$ and as a result, her equity position is now $,$ which represents $$ value of the stock.

If Georgia Brokerage requires a maintenance margin of $40$ percent, then Caroline $$ receive a margin call from Georgia Brokerage.

If Georgia Brokerage requires a $10$ percent annual interest payment on the loaned funds, the shares paid out an annual divided of $$2$ per share, and Caroline sold the shares at the end of the year when the price dropped to $$40$ per share, then what would her return on stocks purchased on margin be$?$

$-36\mathrm{.}00$