答案和详解如下: Q48. D Study Session 17-75-d At the end of Day 1, the balance in the investor's account would be $20. At the beginning of Day 2, the investor would be required to deposit $30 At the end of Day 2, the balance in the investor's account would be $120 At the end of Day 3, the balance in the investor's account would be $100 |