(x+x*1.05+x*1.05*1.05+x1.05*1.05*1.05+x*1.05*1.05*1.05*1.05)/5=72.65
x(1.05^5-1)/[(1.05-1)*5]=72.65
x(1.05^5-1)=18.1625
x≈65.8
(x+x*1.05+x*1.05*1.05+x1.05*1.05*1.05+x*1.05*1.05*1.05*1.05)/5=72.65
x(1.05^5-1)/[(1.05-1)*5]=72.65
x(1.05^5-1)=18.1625
x≈65.8