8. The following table provides data on the price of Y and the quantity demand for X when income levels are 100 and 200. Suppose that the price of X is fixed at $7. 0 1 2 3 4 5 6 7 8 9 10 QDx (Income $100) 114.5 115 115.5 116 116.5 117 117.5 118 118.5 QDx (Income $200) 46.5 47.8 49.1 50.4 51.7 53 54.3 55.6 56.9 58.2 59.5 119 119.5 a Calculate the income elasticity of demand for good X using the midpoint method when income increases from $100 to $200 and when the price of good Y is fixed at $9. Explain your answer. (5 marks) Calculate the cross price elasticity of demand for good X when the price of good Y decreases from $9 to $8 and when income is $100. Explain your answer (5 marks) b