$$\frac{0.9\times0.09+0.9\times0.9}{0.00081}=$$
$1100$
$$\frac{0.081+0.9\times 0.9}{0.00081}$$
$$\frac{0.081+0.81}{0.00081}$$
$$\frac{0.891}{0.00081}$$
$$\frac{89100}{81}$$
$$1100$$
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$11\times 2^{2}\times 5^{2}$
