HP 12c Solutions Handbook page 153

• FC = (G - AMT - CL)
Rule of 78's Rebate
• PV = finance charge.
• I = interest charged at month k.
k
• n = number of months in loan.
•
2 n k –
l k = ----------------------------- -PV
n n
•
Rebate =
• BAL = (n - k) x PMT - Rebate
k
Skipped Payments
• A = number of payments per year.
• B = number of years.
• C = annual percentage rate as decimal.
• D = periodic payment amount.
• E = loan amount.
• K = number of last payment before payments close the first time.
• L = number of skipped payment.
------------------------------------------ -
D =
END
1
D
D = -------------- -
BEGIN
1
Savings
+ 1
+ 1
n k – l
k
-------------------- -
2
E
-------------------------------------------------------------------------------------------------------- -
C
  AB
1 + --- -
–
 
A
END
C
+ --- -
A
k
C

1 + --- -

A
A
C C
  
1 + --- - – 1 + --- -
  
A A
152
A
C

– 1 --- -

A
A A
C
  
L
K + 1 + --- -
  
A
K
– 1