HP 10BII Owner's Manual page 100

Example. An investor wishes to purchase a $100,000 mortgage taken
out at 9% for 20 years. Since the mortgage was issued, 42 monthly
payments have been made. The loan is to be paid in full (a balloon
payment) at the end of its fifth year. What is the yield to the purchaser if
the price of the mortgage is $79,000?
Step 1. Calculate PMT. Make sure FV = 0.
Set to End Mode. Press QE if BEGIN annunciator is displayed.
Keys: Display:
@@©®® 12.00
9.00
QO 240.00
DOTTOR -100,000.00
om
0.00
Description:
Sets payments per year,
Stores interest rate.
Stores number of months.
Stores original amount of
mortgage.
Enters amount left to pay
after 20 years.
Calculates regular
payment.
Step 2. Enter the new value for N indicating when the balloon occurs,
then find FV, the amount of the balloon.
Keys: Display:
Свет 899.73
евз
60.00
у)
88,706.74
100 8: Additional Examples
Description:
Rounds payment to
two decimal places for
accuracy.
Stores number of
payments until balloon.
Calculates balloon
payment (add to final
payment).