Final answer:
To compute the monthly payment for a 15-year fixed-rate mortgage with an original balance of $235,000 and a rate of 4.9%, one must use the loan amortization formula, which entails complex calculations typically performed with a financial calculator or spreadsheet software.
Step-by-step explanation:
To calculate the monthly payment on a 15-year fixed-rate mortgage with an original balance of $235,000 and an interest rate of 4.9 percent, we would use the standard loan amortization formula which is as follows:
M = P[r(1+r)^n] / [(1+r)^n-1]
Where:
- M is the total monthly mortgage payment.
- P is the principal loan amount.
- r is the monthly interest rate (annual rate divided by 12 months).
- n is the number of payments (loan terms in years times 12 months).
Given that the interest rate is 4.9%, the monthly interest rate would be 4.9% divided by 12, or 0.004075. The number of payments for a 15-year mortgage would be 15 times 12, or 180 payments.
By substituting the values we get:
M = $235,000[0.004075(1+0.004075)^180] / [(1+0.004075)^180-1]
Calculations are complex and can be done using a financial calculator or financial functions in a spreadsheet program. The result will give you the monthly payment for the duration of the loan.