$$2\times\frac{22}{7}\times3.5\times25$$
$550$
$$\frac{2\times 22}{7}\times 3.5\times 25$$
$$\frac{44}{7}\times 3.5\times 25$$
$$\frac{44}{7}\times \frac{7}{2}\times 25$$
$$\frac{44\times 7}{7\times 2}\times 25$$
$$\frac{44}{2}\times 25$$
$$22\times 25$$
$$550$$
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$2\times 11\times 5^{2}$
