Using the data below, reduce the project completion time by four days. Assume a linear time-cost trade-off for each task and show, step by step, how you arrived at your schedule. Also indicate the critical path. D.12 B,10 G. 7 Start AO E, 10 16 J.O End H9 F.14 Activity Normal Time Normal Crash Time Crash (days) Cost ($) (days) Cost ($) 10 100 9 110 8 80 100 12 120 10 140 10 100 7 120 14 140 12 190 7 70 5 100 9 90 6 150 6 60 5 80