每半年复利一次 则其年利率应为i: (p/f,i,20)=5,(p/f,0.08,20)=4.661,(p/f,0.09,20)=5.6044 (i-0.08)/(5-4.661)=(0.09-0.08)/(5.6044-4.661);i=0.08+(5-4.661)*(0.09-0.08)/(5.6044-4.661)=8.3593%