$$4 \div 590 \div 0.2 \div 0.9$$
$\frac{20}{531}\approx 0.037664783$
$$\frac{\frac{4}{590}}{0.2\times 0.9}$$
$$\frac{\frac{2}{295}}{0.2\times 0.9}$$
$$\frac{\frac{2}{295}}{0.18}$$
$$\frac{2}{295\times 0.18}$$
$$\frac{2}{53.1}$$
$$\frac{20}{531}$$
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$\frac{5 \cdot 2 ^ {2}}{59 \cdot 3 ^ {2}} = 0.03766478342749529$
