Pusan Iron and Steel, located on the eastern coast of South Korea, is a major supplier of both girder and rolled steel to the emerging construction, appliance, and automobile companies of China. Due to growing sales volumes and the need for faster delivery, Pusan is converting its current single weigh station into a larger, multiple drive-through station. The new drive-through weigh station will consist of a heated, air-conditioned building with a large floor and a small office. The large room will have the scales, a 15 -foot counter, and several display cases for its equipment.

Before erection of the building, the PM evaluated the project using CPM analysis. The following activities with their corresponding times were recorded.

Using CPM analysis, find the expected completion time.

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# Activity 1 Lay 2 3 Insert scale bases Erect frame 4 foundation Dig hole for scale 5 Complete building 6 Insert scales 7 Insert display cases 8 Put in office equipment 9 Give finishing touches Most Optimistic likely Pessimistic 8 10 13 5 13 10 11 4 2 4 6 15 12 20 5 3 Times 6 2 3 8 21 14 30 8 4 10 4 Preceding tasks 2 1,3 4 5 5 7 8,6