If the demand for an item is doubled and the ordering cost halved, the economic order quantity

A project with the following data is to be implemented:

(a) What is the minimum duration of the project?
(b) Draw a Gantt chart for the early schedule
(c) Determine the peak requirement of money and the day on which it occurs in above schedule.

In $$PERT,$$ the distribution of activity times is assumed to be

The manufacturing area of a plant is divided into four quadrants. Four machines have to located one in each quadrant. The total number of possible layouts is