$$8\cdot5+\frac{-6}{100}\times3$$
$\frac{1991}{50}=39.82$
$$40+\frac{-6}{100}\times 3$$
$$40-\frac{3}{50}\times 3$$
$$40+\frac{-3\times 3}{50}$$
$$40+\frac{-9}{50}$$
$$40-\frac{9}{50}$$
$$\frac{2000}{50}-\frac{9}{50}$$
$$\frac{2000-9}{50}$$
$$\frac{1991}{50}$$
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$\frac{11 \cdot 181}{2 \cdot 5 ^ {2}} = 39\frac{41}{50} = 39.82$