$$\frac{1}{2}\times5\times10^{-3}$$
$\frac{1}{400}=0.0025$
$$\frac{5}{2}\times 10^{-3}$$
$$\frac{5}{2}\times \frac{1}{1000}$$
$$\frac{1}{400}$$
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$\frac{1}{2 ^ {4} \cdot 5 ^ {2}} = 0.0025$
