$$500 g 5 \%$$
$25g$
$$500g\times \frac{1}{20}$$
$$\frac{500}{20}g$$
$$25g$$
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$25$
$$\frac{\mathrm{d}}{\mathrm{d}g}(500g\times \frac{1}{20})$$
$$\frac{\mathrm{d}}{\mathrm{d}g}(\frac{500}{20}g)$$
$$\frac{\mathrm{d}}{\mathrm{d}g}(25g)$$
$$25g^{1-1}$$
$$25g^{0}$$
$$25\times 1$$
$$25$$
