The cost to produce q items is C(q)=500+2q?2?? dollars.
Find the marginal cost of producing the 20th item. Interpret your answer in terms of costs. (Fill in all of the ?s)
(a) The marginal cost of producing the 20th item is ____?____.
(b) This means the cost of production (choose increases or decreases) by about $___?_____ when we add one unit to a production level of ___?______ units.