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A deposit of $$$3,000$$ was made into an account that earned interest at the annual rate of $$r$$ percent, compounded annually, where $$r$$ is a constant. The interest was paid into the account, and there were no other deposits to or withdrawals from the account. At the end of the first year, the amount in the account, including interest, was $$$3,090$$. The amount of interest earned for the second year was what fraction of the total amount of interest earned for the $$2$$ years combined?
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2.5.8 复利问题
2.5.8 复利问题
以上解析由 考满分老师提供。
