Casio CFX-9850G PLUS, User'S Manual & Technical Reference

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Example Calculate the interest rate required to repay a $2,300 balance
on a loan in two years paying back $100 per month, when
interest is compounded monthly.
Perform the following key operations from the input screen.
c*bc w
(Input
n
= 2
×
12.)
c
cdaa w
(
PV
= 2,300)
- baa w
(
PMT
= –100)
a w
(
FV
= 0)
bc w
(Monthly installment)
(Monthly compounding)
2
(
I
%)
u u
u u u
Loan when final installment is greater than other installments
Input Condition: Total of equal amount payments is greater than the difference
between the loan amount and final payment amount.
Formula Representation of Input Condition:
PV
,
PMT
,
FV
do not equal zero.
PV
+
FV
> –
n × PMT
when
FV
>
PV
PV
+
FV
< –
n
×
PMT
when
FV
<
PV
Example Calculate the interest rate required to repay a $2,500 balance
on a loan in two years (24 installments) paying back $100 per
month and a final $200 installment, when interest is com-
pounded monthly.
Perform the following key operations from the input screen.
c*bc w
(Input
n
= 2
×
12.)
c
cfaa w
(
PV
= 2,500)
- baa w
(
PMT
= –100)
- caa w
(
FV
= –200)
bc w
(Monthly installment)
(Monthly compounding)
2
(
I
%)
19 - 3
Compound Interest Calculations
The value you input for
P/Y
(the
number of installment periods per
year) is also automatically input for
C/Y
(the number of compounding
periods per year). You can input
another value for
C/Y
if you want.