Suppose the total costs to install windfarms is 30, where Q is the number of towers. Suppose we know that the marginal benefits to install towers is MB = 10-20. 1. What are net benefits at the optimal number of towers? A. 10 B. 6 C. 12.25 D. 3 E. None of the above 2. what are total costs at the optimal number of towers? A. 6 B, 10.5 C. O D. 15 E. None of the above