$$\frac { 1 } { 2 } [ \frac { 1 } { 4 } - \frac { 1 } { 5 } ]$$
$\frac{1}{40}=0.025$
$$\frac{1}{2}\left(\frac{5}{20}-\frac{4}{20}\right)$$
$$\frac{1}{2}\times \frac{5-4}{20}$$
$$\frac{1}{2}\times \frac{1}{20}$$
$$\frac{1\times 1}{2\times 20}$$
$$\frac{1}{40}$$
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$\frac{1}{2 ^ {3} \cdot 5} = 0.025$
