$$\frac{108}{10^{9}}$$
$\frac{27}{250000000}=0.000000108$
$$\frac{108}{1000000000}$$
$$\frac{27}{250000000}$$
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$\frac{3 ^ {3}}{2 ^ {7} \cdot 5 ^ {9}} = 1.08 \times 10^{-7}$