$$\frac{15}{30}-\frac{4}{15}\times\frac{.16}{20}=$$
$\frac{1867}{3750}\approx 0.497866667$
$$\frac{1}{2}-\frac{4}{15}\times \frac{0.16}{20}$$
$$\frac{1}{2}-\frac{4}{15}\times \frac{16}{2000}$$
$$\frac{1}{2}-\frac{4}{15}\times \frac{1}{125}$$
$$\frac{1}{2}-\frac{4\times 1}{15\times 125}$$
$$\frac{1}{2}-\frac{4}{1875}$$
$$\frac{1875}{3750}-\frac{8}{3750}$$
$$\frac{1875-8}{3750}$$
$$\frac{1867}{3750}$$
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$\frac{1867}{2 \cdot 3 \cdot 5 ^ {4}} = 0.4978666666666667$
