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[Financial Mathematics; theory of interest and life contingencies] Erin deposits $100 into an account at beginning of a 4 year period for 40 years. The
[Financial Mathematics; theory of interest and life contingencies] Erin deposits $100 into an account at beginning of a 4 year period for 40 years. The account credits interest at an annual rate i. The accumulated amount in account at the end of 40 years is x, which is 5 times the accumulated amount at the end of 20 years. Find x.
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