$$\frac { ( 9 \times 10 ^ { - 3 } ) ^ { 2 } } { 0.004 } =$$
$0.02025$
$$\frac{\left(9\times \frac{1}{1000}\right)^{2}}{0.004}$$
$$\frac{\left(\frac{9}{1000}\right)^{2}}{0.004}$$
$$\frac{\frac{81}{1000000}}{0.004}$$
$$\frac{81}{1000000\times 0.004}$$
$$\frac{81}{4000}$$
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$\frac{3 ^ {4}}{2 ^ {5} \cdot 5 ^ {3}} = 0.02025$
