A sum of $500 is invested in an account that pays compound interest at a rate of 6% per year. The interest is compounded annually. The investment is withdrawn in the year when the total interest exceeds $300. Find the least number of years the money must be invested before it is withdrawn.[5]
[It is given that for compound interest, total amount \(=P\left(1+\dfrac r{100}\right)^n\).]
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