The demand for clean streets in a neighborhood is Q = 125 - P. For each of the following questions, do not worry whether there are enough streets in the neighborhood. Use this information to answer the next 5 questions. Question 6 1 pts What is the socially optimal number of clean streets in the neighborhood if the marginal cost of cleaning a street is constant at $50? 37.5 Question 7 1 pts What is the socially optimal number of clean streets in the neighborhood if the marginal cost of cleaning a street is constant at $80? 22.5 Question 8 1 pts What is the socially optimal number of clean streets in the neighborhood if the marginal cost of cleaning a street is constant at $150? Question 9 1 pts At what marginal cost would the optimal amount of clean streets be 100? (Do not enter a dollar sign in your answer) Question 10 1 pts At what marginal cost would the optimal amount of clean streets be 50? (Do not enter a dollar sign in your answer)