The marginal cost of producing the 60^th unit is:

a.) $6.50.

b.) $3.50.

c.) $5.00.

d.) $3.00.

marginal cost $7.00 $6.50 E $5.00 -demand C: $3.00 $2.00 _... $0.00 0 10 20 30 40 50 60 70 Quantity