$$2 \times \frac{ 82.4 }{ 2 }$$
$82.4$
$$2\times \frac{824}{20}$$
$$2\times \frac{206}{5}$$
$$\frac{2\times 206}{5}$$
$$\frac{412}{5}$$
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$\frac{103 \cdot 2 ^ {2}}{5} = 82\frac{2}{5} = 82.4$