A construction project has indirect costs totaling $40,000 per week. Major activities in the project and their expected times are shown in this precedence diagram: Crashing costs for each activity are CRASHING COSTS ($ 000) First Second Third Week Week Week $ 18 $ 22 $ - 25 Activity 1-2 2-5 5-7 7-11 11-13 1-3 3-8 8-11 3-9 9-12 12-13 1-4 4-6 6-10 10-12 Determine the optimum time-cost crashing plan. Crash u weeks