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E-49
uu
uu
u I
%
i (effective interest rate)
i (effective interest rate) is calculated using Newton's
Method.
γ
× PV +
α
× PMT +
β
× FV = 0
To I
% from i (effective interest rate)
I
% = 0
PV = – (PMT × n + FV
)
FV = – (PMT × n + PV)
PMT = –
n
PV + FV
n =
PMT
PV + FV
–
= (1+ i × S) ×
, =
(1 + i)
i
1 –
(–Intg(n))
β
β
α
1+ i ×
Frac (n) ....... dn : SI (Setup Screen)
(1+ i )
Frac
(
n
)
........... dn : CI (Setup Screen)
γ
0 ............................ Payment : End
(Setup Screen)
1 ............................ Payment : Begin
(Setup Screen)
i =
100
I%
{
I%
(1+ ) –1
C/Y
P/Y
100 × [C/Y ]
............................... (P/Y = C/Y = 1)
(Other than
those above)
=
{
{
S =
.....
{ }
×
C/Y
×
100...
I% =
(1+ i )–1
P/Y
C/Y
(Other than
those above)
i × 100 ................................. (P/Y = C/Y = 1)
{