If the total cost of producing 4 units is $200 and $160 dollars of the $200 goes to pay for variable factors the:

Group of answer choices

a. the AVC = 40 at q=4

b. the ATC = $50 at q=4

c. AFC =20 at q=2

d. a, b, c are all true

e. a and b are true but c is not.

When output is increased from 2 to 4, cost increases from 10 to 18, the increment in cost is ........and the (approximate) marginal cost is .......

Group of answer choices

a. 4, 8

b. 8, 2

c, 8, 4

d. 2,4

e. None of the above