4. You received $100 at the beginning of year 1, $200 is received at the beginning of year 2, and $300 is received at the beginning of year 3. If these cash flows are deposited at 12 percent, what is the combined future value of the cash flows at the end of year 3?

6. Jia borrows $50,000 at 10 percent annually compounded interest to be repaid in four equal annual installments. What is the amount of each annual installment payment?

7. Xiao Xin is planning to accumulate $40,000 by the end of 5 years by making 5 equal annual deposits. If she plans to make her first deposit today and can earn an annual compound rate of 9 percent on her investment, how much must each deposit be in order to accumulate the $40,000?