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Formulae (4)

CAGR = \left(\frac{V_f}{V_i}\right)^{1/n} - 1

Compound annual growth rate of an investment.

ROI = \frac{V_f - V_i}{V_i} \times 100\%

Percentage gain or loss on an investment.

t \approx \frac{72}{r}

Approximate years to double an investment.

PP = \frac{\text{Initial Investment}}{\text{Annual Cash Flow}}

Time to recover an investment.

Estimate how many years it takes an investment to double: divide 72 by the annual interest rate.