$$0.0009 \div 0.02 \div 0.4$$
$0.1125$
$$\frac{0.0009}{0.02\times 0.4}$$
$$\frac{0.0009}{0.008}$$
$$\frac{9}{80}$$
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$\frac{3 ^ {2}}{5 \cdot 2 ^ {4}} = 0.1125$