$$10+25+10 \times 25/100$$
$\frac{75}{2}=37.5$
$$35+\frac{10\times 25}{100}$$
$$35+\frac{250}{100}$$
$$35+\frac{5}{2}$$
$$\frac{70}{2}+\frac{5}{2}$$
$$\frac{70+5}{2}$$
$$\frac{75}{2}$$
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$\frac{3 \cdot 5 ^ {2}}{2} = 37\frac{1}{2} = 37.5$
