Suppose that under the Plan of Repayment one should pay off the debt in a number of equal end-of-month installments (principal and interest). This is the customary way to pay off loans on automobiles, house mortgages, etc. A friend of yours has financed $29,000 on the purchase of a new automobile, and the annual interest rate is 6% (0.50% per month).
a. Monthly payments over a 60-month loan period will be how much?
b. How much interest and principal will be paid within three month of this loan?
(a) Monthly payment ($) = Loan amount / P/A(0.5%, 60) = 29,000 / 51.7256** = 560.65
(b) Loan amortization schedule for first 3 months is as follows. Note that
(i) Interest payment in month N = Beginning balance in month N x 0.005
(ii) Principal payment in month N = $560.65 - Interest payment in month N
Month | Beginning balance ($) | Monthly Payment ($) | Interest Payment ($) | Principal Payment ($) | Ending Balance ($) |
1 | 1,50,000.00 | 560.65 | 62.50 | 498.15 | 1,49,439.35 |
2 | 1,49,439.35 | 560.65 | 62.27 | 498.38 | 1,48,878.70 |
3 | 1,48,878.70 | 560.65 | 62.03 | 498.62 | 1,48,318.05 |
TOTAL | 186.80 | 1,495.15 |
**P/A(r%, N) = [1 - (1 + r)-N] / r
P/A(0.5%, 60) = [1 - (1.005)-60] / 0.005 = (1 - 0.7414) / 0.005 = 0.2586 / 0.005 = 51.7256
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