D Question 1 2.5 pts Suppose the Borjas Brothers has only one variable input, labor, and total output is zero when labor is zero. When the firm hires 5 workers the firm produces 90 units of output. Fixed costs of production are $60 and the variable cost per unit of labor is $10. The marginal product of the sixth unit of labor is 4. Given this information, what is the average variable cost of production when the firm hires 6 workers? O $0.81 O $15.67 $15.00 O $0.63 Next Not saved Submit Quiz