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Question 7.4: Joanne has taken out a €200,000 mortgage over 20 years at 8%......

Joanne has taken out a €200,000 mortgage over 20 years at 8% per annum. Calculate her repayment amount per annum to amortize the mortgage.

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We apply the formula to calculate her annual repayment:

A=\frac{P\;r}{\left[1-\frac{1}{(1+r)^{n}}\right]}

 

A=\frac{200000\ \ast\ 0.08}{\left[1-\frac{1}{(1+0.08)^{20}}\right]}

= \frac{160000}{\left[1-\frac{1}{4.661}\right]}

= €20,370

We adjust the formula for the more common case where the interest is compounded several times per year (usually monthly), and so n = # years ∗ # compoundings, and the interest rate per compounding period is i = r/# compoundings.

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