Suppose that the dollar cost of producing x radios is c (x) = 400 + 20x - 0.2x

2. Find the marginal cost when 30

radios are produced.

cost of producing x radios is c (x) = 400 + 20x - 0.2x

where:

x=number of units

thus the cost required to produce 30 units will be given by

c (30) = 400+20 (30) - 0.2 (30)

c (30) = 400+600-6

c (30) = 994

Answer: Marginal cost will be $994