$$\frac { 1 } { 4 } \cdot ( \frac { 3 } { 10 } - \frac { 1 } { 5 } \div 2 \frac { 1 } { 4 } )$$
$\frac{19}{360}\approx 0.052777778$
$$\frac{1}{4}\left(\frac{3}{10}-\frac{4}{5\left(2\times 4+1\right)}\right)$$
$$\frac{1}{4}\left(\frac{3}{10}-\frac{4}{5\left(8+1\right)}\right)$$
$$\frac{1}{4}\left(\frac{3}{10}-\frac{4}{5\times 9}\right)$$
$$\frac{1}{4}\left(\frac{3}{10}-\frac{4}{45}\right)$$
$$\frac{1}{4}\left(\frac{27}{90}-\frac{8}{90}\right)$$
$$\frac{1}{4}\times \frac{27-8}{90}$$
$$\frac{1}{4}\times \frac{19}{90}$$
$$\frac{1\times 19}{4\times 90}$$
$$\frac{19}{360}$$
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$\frac{19}{2 ^ {3} \cdot 3 ^ {2} \cdot 5} = 0.05277777777777778$
