单选题 An investor purchases 200 shares of Merxx on margin. The shares are trading at $40. Initial and maintenance margins are 50 percent and 25 percent. If the investor sells the stock when the price rises to $50 at year-end, the return on the investment would be closest to:

A、

A. 50.00%.
B、

B. 18.75%.
C、

C. 25.00%.

【正确答案】 A

【答案解析】Profit =10000-8000=2000, Return =2000/4000=50%.