单选题
Assume the following annual forward rates were calculated from the yield curve.
| Time Period | Forward Rate |
| 1y1y | 0.50% |
| 1y1y | 0.70% |
| 2y1y | 1.00% |
| 3y1y | 1.50% |
| 4y1y | 2.20% |
The four-year spot rate is closest to:
【正确答案】
B
【答案解析】
The four-year spot rate can be computed as:
