The total cost, in dollars, to produce q items is given by the function $\displaystyle {C}{\left({q}\right)}={50},{000}+{13.60}{q}-{0.003}{q}^{{2}}$ .

Find the total cost of producing 600 items.

$

Find the marginal cost when producing 600 items.  That is, find the cost of producing the 601^st item.

$