$$\frac { 4 x } { 50 }$$
$\frac{2}{25} = 0.08$
$$\frac{\mathrm{d}}{\mathrm{d}x}(\frac{2}{25}x)$$
$$\frac{2}{25}x^{1-1}$$
$$\frac{2}{25}x^{0}$$
$$\frac{2}{25}\times 1$$
$$\frac{2}{25}$$
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$\frac{2x}{25}$
$$\frac{2}{25}x$$