Problem 4: Project Scheduling (22 points) Monohan Machinery specializes in developing weed-harvesting equipment that is used to clear small lakes of weeds. George Monohan, president of Monohan Machinery, is convinced that harvesting weeds is far better than using chemicals to kill weeds. Chemicals cause pollution, and the weeds seem to grow faster after chemicals have been used. George is contemplating the construction of a machine that would harvest weeds on narrow rivers and waterways. The activities that are necessary to build one of these experimental weed-harvesting machines are listed in the following table. ACTIVITY IMMEDIATE PREDECESSORS CE D, F a. Construct a network for these activities. (4 points) After consulting with Butch Radner, George Monohan was able to determine the activity times for constructing the weed-harvesting machine to be used on narrow rivers. The activity times are shown in the following table: ACTIVITY TIME (WEEKS) b. Determine the ES, EF, LS, and LF time, and slack for each activity. (12 points) c. Determine the total project completion time and the critical path. (6 points)