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Interest

SShanda11y ago
Two investments are available. Investment P offers interest of 5% per year compounded half yearly for a period of 4 years. Investment Q offers one interest payment of 18% at the end of its 4 year life. What is the annual effective rate of interest offered by each of the two investments? Can I see a calculation please?
John MoffatJohn MoffatTutor11y ago#1
For investment P, the interest is 2.5% every six months. So the annual effective rate is (1.025^2) – 1 = 0.0506 or 5.06% (it is to the power 2 because there are 2 six-months in a year) For investment Q, if R is the annual interest, then (1+R)^4 = 1.18 So R = (4th root of 1.18) – 1 = 0.0422 or 4.22%
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