$$\frac{ 3 }{ 40 } \times 100$$
$\frac{15}{2}=7.5$
$$\frac{3\times 100}{40}$$
$$\frac{300}{40}$$
$$\frac{15}{2}$$
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$\frac{3 \cdot 5}{2} = 7\frac{1}{2} = 7.5$
