3. In Problem 2, suppose that after digging all sections, plumbing work can be started but only 20% of the job can be completed before any concrete is poured. After each section of the footings is completed, the remaining plumbing work can be started provided that the preceding 20% portion is complete. Construct the project network using an Activity on Node representation.

This is problem2

The footings of a building can be completed in four connective sections. The activities for each section include (1) digging, (2) placing steel, and (3) pouring concrete. The digging of one section cannot start until that of the preceding section has been completed. The same restriction applies to pouring concrete. Develop the project network using an Activity on Node representation.

I AM ONLY LOOKING FOR SOLUTION TO PROBLEM 3