please solve questions 9,10

do not use excel please,

thank you :)

9. You purchased200 shares of ABC common stock on margin at S50 per share. Assume the initial margin is 50% and the maintenance margin is 30%. You will get a margin call if the stock drops below -. (Assume the stock pays no dividends, and ignore interest on the margin loan.) A. 526.55 B. $35.71 C. 528.95 D. 530.77 10. An investor puts up $5,000 but borrows an equal amount of money from his broker to double the amount invested to $10,000. The broker charges 7% on the loan. The stock was originally purchased at $25 per share, and in 1 year the investor sells the stook for $28. The investor's rate of retum was A. 17% B. 12% C. 14% D. 19%