Question 5 10 pts Topic: Demand-Supply Consider a market for educational services composed of the following demand and supply functions: Qd = Income + Px -Py -P QS = 3P In addition we have the following information: Year Income Px Py 2021 18 12 6 2022 14 12 6 Compute the change in total revenue -in equilibrium- for educational services from year 2021 to year 2022. This is, total revenue in year 2022 minus total revenue in year 2021. (Enter your answer to one integer. For "800", you would write 800). Do not round