1. An economist estimated that the cost function of a single-product firm is: Cost(Q) = 200 + 10Q + 20Q2 + 5Q3 ; based on this equation calculate:
a. The fixed cost of producing 8 units of output
b. The variable cost of producing 8 units of output
c. The total cost of producing 8 units of output
d. The average fixed cost of producing 8 units of output
e. The average variable cost of producing 8 units of output
f. The average total cost of producing 8 units of output
g. The marginal cost when producing 8 units of output
a. The fixed cost of producing 8 units of output
Cost(Q) = 200 + 10Q + 20Q^2 + 5Q^3
FC=the cost is same at all level and it is equal to the total cost at Q=0 and it is a constant term in the cost function
FC=200 at all level of output
b. The variable cost of producing 8 units of output
VC=TC-FC=the cost function except constant term =10Q + 20Q^2 + 5Q^3=10*8 + 20*8^2 + 5*8^3=3920
c. The total cost of producing 8 units of output
TC=FC+VC=200+3920=4120
d. The average fixed cost of producing 8 units of output
AFC=FC/Q
AFC=200/8=25
e. The average variable cost of producing 8 units of output
AVC=VC/Q=3920/8=490
f. The average total cost of producing 8 units of output
ATC=AFC+AVC=25+490=515
g. The marginal cost when producing 8 units of output
MC=dC/dQ=10+40Q+15Q^2
Q=8
MC=10+40*8+15*8^2=1290
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