The population of a town increases by 5% annually. If its population in 1981 was 138915, in 1978 it was:

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$$\begin{gathered} \mathrm{Population} \mathrm{in} 1978= \frac{138915}{{\left(1+{\displaystyle \frac{5}{100}}\right)}^3} \\ =\left(138915\times \frac{20}{21}\times \frac{20}{21}\times \frac{20}{21}\right) \\ \mathbf{=}\mathbf{ }\mathbf{1}\mathbf{,}\mathbf{20}\mathbf{,}\mathbf{000} \end{gathered}$$

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