$$\frac{1}{2}\times5\times10^{-2}$$
$\frac{1}{40}=0.025$
$$\frac{5}{2}\times 10^{-2}$$
$$\frac{5}{2}\times \frac{1}{100}$$
$$\frac{1}{40}$$
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$\frac{1}{2 ^ {3} \cdot 5} = 0.025$