please only do 11.20 part

8 Pinoy 11.19 An area of an interconnected power system has two fossil-fuel units operating on eco- nomic dispatch. The variable operating costs of these units are given by 4P, +0.02P; for 0

100 MW hr $ C2 = 0.03P br where P, and P, are in megawatts. Determine the power output of each unit, the in- cremental operating cost, and the total cost CT that minimizes Cy as the load demand Pt varies from 200 to 700 MW. Generating-unit inequalities and transmission losses are neglected 11.20 Rework Problem 11.19 if the units are subject to the following inequality constraints: 100