Q2: (4 marks) The Cobb-Douglas utility function is given by: U(x,y) = x"y The indirect utility function for the above utility function is as follows: apBja+B v(Px, Py, 1) = (a + B)Q+B Papp where P and Py prices of goods X and Y respectively, and I is the consumer's total budget for these two goods. Assume that a = 2 and = 2 (a) Using envelope properties (Roy's identity), find the Marshallian demand function for each good. (2 marks) (b) Find the expenditure function. (2 marks)