$$\frac{ x }{ 12 } \times \frac{ 600000 }{ 12 }$$
$\frac{12500x}{3}$
$$\frac{x}{12}\times 50000$$
$$\frac{x\times 50000}{12}$$
$$x\times \frac{12500}{3}$$
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$\frac{12500}{3} = 4166\frac{2}{3} = 4166.666666666667$
$$\frac{\mathrm{d}}{\mathrm{d}x}(\frac{x}{12}\times 50000)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(\frac{x\times 50000}{12})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(x\times \frac{12500}{3})$$
$$\frac{12500}{3}x^{1-1}$$
$$\frac{12500}{3}x^{0}$$
$$\frac{12500}{3}\times 1$$
$$\frac{12500}{3}$$