$$(1/120+1/500)30/8$$
$\frac{31}{800}=0.03875$
$$\frac{\left(\frac{25}{3000}+\frac{6}{3000}\right)\times 30}{8}$$
$$\frac{\frac{25+6}{3000}\times 30}{8}$$
$$\frac{\frac{31}{3000}\times 30}{8}$$
$$\frac{\frac{31\times 30}{3000}}{8}$$
$$\frac{\frac{930}{3000}}{8}$$
$$\frac{\frac{31}{100}}{8}$$
$$\frac{31}{100\times 8}$$
$$\frac{31}{800}$$
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$\frac{31}{2 ^ {5} \cdot 5 ^ {2}} = 0.03875$