$$2 \times \frac{ 82.4 \times 3 }{ 2 }$$
$247.2$
$$2\times \frac{247.2}{2}$$
$$2\times \frac{2472}{20}$$
$$2\times \frac{618}{5}$$
$$\frac{2\times 618}{5}$$
$$\frac{1236}{5}$$
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$\frac{3 \cdot 103 \cdot 2 ^ {2}}{5} = 247\frac{1}{5} = 247.2$
