Question 12 0.5 pts Carlos owns a car repair business. Which of the following would be a xed input in his rm? 0 Spare tires 0 His repair shop building 0 Car batteries 0 Mechanics Question 13 0.5 pts If the average product of 10 workers is 50 bushels of wheat and the average product of 11 workers of wheat is 48 bushels of wheat, then the marginal product of the 11th worker was ___________ bushels of wheat. Question 14 0.5 pts Suppose a rm doubles its output in the long run. At the same time the average cost of production decreases. We can conclude that the rm is O exploiting the economies of scale available to it 0 facing constant returns to scale 0 facing diseconomies of scale 0 not using the available technology efciently