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Mortgage & Real Estate FinanceInterest CalculationsMEDIUM

A borrower has a $300,000 fixed-rate mortgage at 4% per year, compounded semi-annually, with monthly payments. What effective monthly interest rate is used to calculate the payment?

Correct Answer

A) 0.331%

With semi-annual compounding, the half-year rate is 4% ÷ 2 = 2%, and the equivalent monthly rate is (1.02)^(1/6) − 1 = 0.003306, or about 0.331%. Dividing 4% by 12 (0.333%) ignores the compounding convention, and 0.327% is the rate for annual compounding.

Answer Options
A
0.331%
B
0.327%
C
0.333%
D
0.167%

Why This Is the Correct Answer

The semi-annual rate is 2%. Six monthly periods must compound to that 2%, so the monthly rate is (1.02)^(1/6) − 1 = 0.003306, which rounds to 0.331%. This is the rate that goes into the payment formula for a Canadian fixed-rate mortgage paid monthly.

Why the Other Options Are Wrong

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Key Terms

semi-annual compoundingeffective monthly ratemortgage payment calculationCanadian mortgage convention
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