$$10+250+3.785L$$
$3.785$
$$\frac{\mathrm{d}}{\mathrm{d}L}(260+3.785L)$$
$$3.785L^{1-1}$$
$$3.785L^{0}$$
$$3.785\times 1$$
$$3.785$$
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$\frac{757L}{200}+260$
$$260+3.785L$$