HP 35s User Manual page 276

Part 2. What interest rate would reduce the monthly payment by $10?
Keys:
(In RPN mode)

I
 






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)

F

17-6
Miscellaneous Programs and Equations
Display:

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














Display:

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


Description:
Displays the leftmost hart of the 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:
Displays leftmost part of the TVM
equation.
Selects F; prompts for P.
Retains P; prompts for I.