Use the following table to answer the remainder of the questions: Activity Predecessors Description Duration Resource demand 1 1 1 Start job 2 1 Relocate electric 6 4 3 1 Excavate 5 3 4 3 Install pipe section #1 10 4 5 4 Backfill section #1 5 3 6 4 Install pipe section #2 12 5 7 5,6 Backfill section #2 8 2 8 6 Test pipe sections 3 4 9 7,8 Grade and sod 7 3 10 2,8 Install manhole 3 3 11 10 Test relocated electric 2 5 12 9,11 Final inspection 1 2 5 units of the resource are available in each period. Scheduling all activities as early as possible, calculate the total resource need in each of the following periods: Period Total Resource Need 1st 1 10th 20th 4 Please only answer the total resource for period 20 - I have already calculated the resources for periods 1 and 10