HP 15c - Manual (Page 46)

46 Section 3: The Memory Stack, LAST X, and Data Storage
2. Use arithmetic with constants to calculate the remaining
balance of a $1000 loan after six payments of $100 each and
an interest rate of 1% (0.01) per payment period.
Procedure: Load the stack with (1 + i), where i = interest rate,
and key in the initial loan balance. Use the following formula
to find the new balance after each payment.
New Balance = ((Old Balance)×(1 + i)) - Payment
The first part of the key sequence would be:
1.01 vvv 1000
For each payment, execute:
* 100 -
Balance after six payments: $446.32.
3. Store 100 in R
5
. Then:
1. Divide the contents of R
5
by 25.
2. Subtract 2 from the contents of R
5
.
3. Multiply the contents of R
5
by 0.75.
4. Add 1.75 to the contents of R
5
.
5. Recall the contents of R
5
.
Answer: 3.2500.