
Answer:
Let's calculate the price of UST one-year from now using PV function
Insert N = 9 x 2 = 18, PMT = 6% x 1000 / 2 = 30, FV = 1000, I/Y = 5%/2 = 2.5%
=> Compute PV = $1,071.77 is the price in year 1
Similarly, price in year 2 can be calculated using I/Y = 7%/2 = 3.5% and N = 8 x 2 = 16
=> PV = $939.53 in year 2
Price today = $990
Now, total value at the end of year 1 = 30 x (1 + 5%/2) + 30 + 1071.77 = $1,132.52
Total Return for 1-year = 1,132.52 / 990 - 1 = 14.40%
Similarly, total value at the end of year 2 = 30 x (1 + 2.5%)^3 + 30 x (1 + 2.5%)^2 + 30 x (1 + 2.5%) + 30 + 939.53 = $1,034.10
Total Return for 2-year = 1,034.10 / 990 - 1 = 4.46%