Poor old Charlie. He seems to start every chapter in the Workouts. Suppose he has u = xy and an income of 120 to allocate between these goods. Prices are pX= 1 and pY= 2. Next month the government will introduce a tax of 3 dollars per unit of x. The approximate change in Charlie's consumer surplus is equal to _______and the exact change in his consumer surplus is equal to __________. No diagram is required.