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in BUS 2016H - Financial Mathematics by

Hi, I've attempted this question multiple times and I'm not sure what I'm doing incorrectly, but the answer that I get definitely seems wrong. This is the question:

4a. To accumulate R8000 at the end of 3n years, deposits of R98 are made at the end of each of the first n years and R196 at the end of each of the next 2n years.

The annual effective rate of interest is i. You are given delta = 2/n where delta is the force of interest.

Calculate i.

The answer that I keep getting is i = 558.63%. I'm thinking that the present value equation I've made has multiple solutions for i and this is just one of them, but I'm not sure how to go about finding the rest.

Thank you.

IMG_3182.heic (0,7 MB)

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by (480 points)
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I tried to do the question a few times as well, and got i = 558,633% all the time.

I can’t view your picture on my phone for some reasonimage , but let me just upload my attempt.