Eric Nicholas K's answer to immanlyn's Junior College 1 H2 Maths Singapore question.
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Working on part iii now.
As for part b, I do not quite understand the "theoretical maximum total interest payable" part. This could mean one of the following cases.
1. Interest halved every year, but no withdrawals made
2. Interest not halved for the same withdrawal rate
3. Interest not halved AND interest not withdrawn