P.20.3 a. The incremental fuel costs for the two plants are given by dej de: =0.2P+45: = 0.25P; +34 dP dP where C is in Rs/h and P is in MW. If both units operate at all times and maximum and minimum loads on each are 100 and 20 MW, respectively, determine the eco- nomic load schedule of the plants for the loads of 80 and 180 MW. Neglect the line losses. b. write short notes on physical interpretation of coordination equation.