$$2 \frac { 1 } { 2 } \%$$
$\frac{1}{40}=0.025$
$$\frac{2\times 2+1}{2\times 100}$$
$$\frac{4+1}{2\times 100}$$
$$\frac{5}{2\times 100}$$
$$\frac{5}{200}$$
$$\frac{1}{40}$$
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$\frac{1}{2 ^ {3} \cdot 5} = 0.025$