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.