HP 33s User Manual page 287

Part 2. What interest rate would reduce the monthly payment by $10 ?
Keys:
(In RPN mode)
º d
Û
I
¹ f
Ù
10
¥
¥
¥
¥
¸
12
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)
º d
Û
F
Display:
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Miscellaneous Programs and Equations
Description:
TVM equation.
Selects I ; prompts for P .
Rounds the payment to two
decimal places.
Calculates new payment.
Stores –176,89 in P ; prompts for
N.
Retains 36 in N ; prompts for F .
Retains 0 in F ; prompts for B .
Retains 5750 in B ; calculates
monthly interest rate.
Calculates annual interest rate.
Description:
equation.
Selects F ; prompts for P .
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