The number of years it took the amount invested to accrue to £316.53 is 23.7 years.
Compound interest is when both the money invested and the money already accrued earn interest.
Number of years = in(fv / pv) r
FV = future value
PV = present value
r = interest rate
(IN 316.53 / 175) / 0.025 = 23.7 years
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