The number of years it would take $4000 to grow to $4616 is 2.92 years.
When an amount earns compound interest compounded semi annually, it means that both the amount invested and the interest accrued increases in value twice yearly.
Number of years = (In FV / PV) / r
(In 4616 / 4000) / 0.049 = 2.92 years
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