$$800\times\frac{3}{8}+800\times\frac{2}{5}$$
$620$
$$\frac{800\times 3}{8}+800\times \frac{2}{5}$$
$$\frac{2400}{8}+800\times \frac{2}{5}$$
$$300+800\times \frac{2}{5}$$
$$300+\frac{800\times 2}{5}$$
$$300+\frac{1600}{5}$$
$$300+320$$
$$620$$
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$2^{2}\times 5\times 31$
