∑t=0nCt(1+i)t\displaystyle \sum_{t=0}^{n} \frac{C_t}{(1 + i)^t}t=0∑n(1+i)tCt
NPV=0NPV=0NPV=0
sn,fns_n, f_{n}sn,fn
∑t=1nt×PVt∑t=1nPVt\dfrac{\sum_{t=1}^n t \times PV_t}{\sum_{t=1}^n PV_t}∑t=1nPVt∑t=1nt×PVt
A=LA=LA=L