Casio fx-9750G PLUS User Manual
Page 355
327
n
PMT =
–
PV + FV
PMT
n =
–
PV + FV
• A deposit is indicated by a plus sign (+), while a withdrawal is indicated by a
minus sign (–).
u
u
u
u
u
Converting between the nominal interest rate and effective
interest rate
The nominal interest rate (
I
% value input by user) is converted to an effective
interest rate (
I
%') when the number of installments per year (
P/Y
) is different from
the number of compound interest calculation periods (
C/Y
). This conversion is
required for installment savings accounts, loan repayments, etc.
I%' =
I%
(1+
)
–1
[C / Y ]
[P / Y ]
100
× [C / Y ]
{ }
×100
P/Y
: installment
periods per year
C/Y
: compounding
periods per year
When calculating
n
,
PV
,
PMT
,
FV
The following calculation is performed after conversion from the nominal interest
rate to the effective interest rate, and the result is used for all subsequent
calculations.
i = I%'
÷100
When calculating
I
%
After
I
% is obtained, the following calculation is performed to convert to
I
%'.
I%' =
I%
(1+
)
–1
[C / Y ]
[P / Y ]
100
{ }
×[C / Y ]×100
P/Y
: installment
periods per year
C/Y
: compounding
periods per year
The value of
I
%' is returned as the result of the
I
% calculation.
Press 2 (CMPD) in the Financial 1 screen to display the input screen for
compound interest calculation.
n
..................... number of compound periods
I
% ................... annual interest rate
PV
.................. present value (loan amount in case of loan; principal in case
of savings)
Compound Interest Calculations
19 - 3