$$\frac{2}{5}; \frac{1}{8}; \frac{2}{4}; \frac{3}{10}$$
$\frac{3}{400}=0.0075$
$$\frac{2\times 1}{5\times 8}\times \frac{2}{4}\times \frac{3}{10}$$
$$\frac{2}{40}\times \frac{2}{4}\times \frac{3}{10}$$
$$\frac{1}{20}\times \frac{2}{4}\times \frac{3}{10}$$
$$\frac{1}{20}\times \frac{1}{2}\times \frac{3}{10}$$
$$\frac{1\times 1}{20\times 2}\times \frac{3}{10}$$
$$\frac{1}{40}\times \frac{3}{10}$$
$$\frac{1\times 3}{40\times 10}$$
$$\frac{3}{400}$$
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$\frac{3}{2 ^ {4} \cdot 5 ^ {2}} = 0.0075$
