$$\frac { 3 } { 10 } \cdot \frac { 1 } { 2 }$$
$\frac{3}{20}=0.15$
$$\frac{3\times 1}{10\times 2}$$
$$\frac{3}{20}$$
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$\frac{3}{2 ^ {2} \cdot 5} = 0.15$
