$$\frac { 8 } { 20 } \times \frac { 1 } { 4 } \frac { 2 } { 80 }$$
$\frac{1}{400}=0.0025$
$$\frac{2}{5}\times \frac{1}{4}\times \frac{2}{80}$$
$$\frac{2\times 1}{5\times 4}\times \frac{2}{80}$$
$$\frac{2}{20}\times \frac{2}{80}$$
$$\frac{1}{10}\times \frac{2}{80}$$
$$\frac{1}{10}\times \frac{1}{40}$$
$$\frac{1\times 1}{10\times 40}$$
$$\frac{1}{400}$$
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$\frac{1}{2 ^ {4} \cdot 5 ^ {2}} = 0.0025$
