Personal Finance 123
Program Instructions:
1. Key in the program.
2.
Press
fCLEARG.
3.
Key in the annual interest rate and press
gC .
4.
Key in the term of the loan in years and press
gA .
5.
Key in the purchase price and press
?1.
6.
Key in the percent down and press
?2.
7.
Key in the tax rate in dollars per thousand and press
?3.
8.
To calculate the approximate monthly payment, press
t.
9. For a new case, store only the new variables by performing steps 3 thru 7 as needed.
Press
t for the new approximate monthly payment.
Example: Solve the previous example using the HP 12C Platinum program.
12c platinum / 12C
RPN Keystrokes
12c platinum
ALG Keystrokes
Display Comments
fCLEARG fCLEARG
10.75gC 10.75gC
0.90
Monthly interest.
35gA 35gA
420.00
Months of loan.
65000?1 65000?1
65,000.00
Purchase price.
10?2 10?2
10.00
Percent down.
25?3 25?3
25.00
Tax rate per thousand.
t t
-672.16
Approximate monthly
payment.
What would the approximate payment be if the loan was at 10% interest?
12c platinum / 12C
RPN Keystrokes
12c platinum
ALG Keystrokes
Display Comments
10gCt 10gCt
-638.33
Approximate monthly
payment.
What if the down payment is increased to 20%?
12c platinum / 12C
RPN Keystrokes
12c platinum
ALG Keystrokes
Display Comments
20?2t 20?2t
-582.45
Approximate monthly
payment.
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