$$4 \div 590 \div 0.25 \div 0.2 \div 0.9$$
$\frac{80}{531}\approx 0.150659134$
$$\frac{\frac{\frac{4}{590}}{0.25}}{0.2\times 0.9}$$
$$\frac{\frac{4}{590\times 0.25}}{0.2\times 0.9}$$
$$\frac{\frac{4}{147.5}}{0.2\times 0.9}$$
$$\frac{\frac{40}{1475}}{0.2\times 0.9}$$
$$\frac{\frac{8}{295}}{0.2\times 0.9}$$
$$\frac{\frac{8}{295}}{0.18}$$
$$\frac{8}{295\times 0.18}$$
$$\frac{8}{53.1}$$
$$\frac{80}{531}$$
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$\frac{5 \cdot 2 ^ {4}}{59 \cdot 3 ^ {2}} = 0.15065913370998116$