E-49
u
u
u
u
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)
{