$$0.35+2/8+0.25$$
$0.85$
$$0.35+\frac{1}{4}+0.25$$
$$\frac{7}{20}+\frac{1}{4}+0.25$$
$$\frac{7}{20}+\frac{5}{20}+0.25$$
$$\frac{7+5}{20}+0.25$$
$$\frac{12}{20}+0.25$$
$$\frac{3}{5}+0.25$$
$$\frac{3}{5}+\frac{1}{4}$$
$$\frac{12}{20}+\frac{5}{20}$$
$$\frac{12+5}{20}$$
$$\frac{17}{20}$$
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$\frac{17}{5 \cdot 2 ^ {2}} = 0.85$