HP 33s User Manual
Page 287
Miscellaneous Programs and Equations
17–5
Part 2.
What interest rate would reduce the monthly payment by $10?
Keys:
(In RPN mode)
Display:
Description:
| H
º º1.1-ª Displays the leftmost hart of the
TVM equation.
I
@
. )
Selects I; prompts for P.
{ J
@
. )
Rounds the payment to two
decimal places.
10
@
.
)
Calculates new payment.
g
@
)
Stores –176,89 in P; prompts for
N.
g
@
)
Retains 36 in N; prompts for F.
g
@
8
)
Retains 0 in F; prompts for B.
g
#
/
)
Retains 5750 in B; calculates
monthly interest rate.
12
z
)
Calculates annual interest rate.
Part 3.
Using the calculated interest rate (6.75%), assume that you sell the car
after 2 years. What balance will you still owe? In other words, what is the future
balance in 2 years?
Note that the interest rate, I, from part 2 is not zero, so you won't get a #
&
error when you calculate the new I.
Keys:
(In RPN mode)
Display:
Description:
| H
º º1.1-ªDisplays leftmost part of the TVM
equation.
F
@
.
)
Selects F; prompts for P.