Can you explain plainly how you would solve these problems? Explain how you got your answer as well.

Price Quantity Dollars per Demanded unit) (Units) 200 0 160 30 120 60 80 90 40 120 0 150 6. Refer to Table 5-2. Using the midpoint method, if the price falls from $160 to $120, the price elasticity of demand is a. zero. b. unit elastic. c. inelastic. d. elastic. Scenario 5-1. Suppose the demand function for good X is given by: Odx - 15 - 0.5Px - 0.8Py where Odx is the quantity demanded of good X, Px is the price of good X, and Py is the price of good Y, which is related to good X. 7. Refer to Scenario 5-1. Using the midpoint method, if the price of good X is constant at $10 and the price of good Y decreases from $10 to $8, the cross-price elasticity of demand is about a. 0.57, and X and Y are substitutes. b. -0.22, and X and Y are complements c. -0.80, and X and Y are complements d. -2.57, and X and Y are complements