$$12\cdot5+9\times2\cdot5+\frac{1}{2}$$
$\frac{301}{2}=150.5$
$$60+18\times 5+\frac{1}{2}$$
$$60+90+\frac{1}{2}$$
$$150+\frac{1}{2}$$
$$\frac{300}{2}+\frac{1}{2}$$
$$\frac{300+1}{2}$$
$$\frac{301}{2}$$
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$\frac{7 \cdot 43}{2} = 150\frac{1}{2} = 150.5$
