Which of the following represents the price elasticity of demand? Question 4 options: (change in Q/P) / (Change in P/Q) (change in Q/P) + (change in P/Q) (change in Q/change P) x (P/Q) (change in Q/P) - (change in P/Q)Use the following information to answer the question below. The demand for books is: Qd = 120 - p The supply of books is: Qs = 5P What is the equilibrium quantity of books sold? Question 3 options: 25 50 75 100