HP 10bII+ User Manual page 169

Cash-Flow Calculations
i% = periodic interest rate.
j = the group number of the cash flow.
CF = amount of the cash flow for group j.
j
n = number of times the cash flow occurs for group j.
j
k = the group number of the last group of cash flows.
∑
Nj = = total number of cash flows prior to group j.
n
l
≤ <
1 l j
When NPV = 0, the solution for i% is the periodic internal rate of return.
NFV = NPV x SPFV(i % : N) where N =
TOTAL =
COUNT =
⎛
1
k
⎜
∑
× ⎜
------------------------------------- -
NPV = CF + CF
0 j
⎜
⎝
j = 1
k
∑
( × )
n CF
j j
j = 0
k
∑
n
j
=
j 0
–
n
⎛ i% ⎞
⎞
j
– 1 + ------- -
⎝ ⎠
⎟
100
–
⎛ i% ⎞
⎟ ×
1 + ------- -
⎝ ⎠
i%
100
⎟
------- -
⎠
100
k
∑
n
j
j = 1
Appendix B: More About Calculations
n
j
III