Consider the (simplified) list of activities and predecessors that are involved in building a house (Table 20).

TABLE 20

Activity	Description	Immediate Predecessors	Duration (Days)
A	Build foundation	—	5
B	Build walls and ceilings	A	8
C	Build roof	B	10
D	Do electrical wiring	B	5
E	Put in windows	B	4
F	Put on siding	E	6
G	Paint house	C, F	3

a Draw a project network, determine the critical path, find the total float for each activity, and find the free float for each activity.

b Suppose that by hiring additional workers, the duration of each activity can be reduced. The costs per day of reducing the duration of the activities are given in Table 21. Write down the LP to be solved to minimize the total cost of completing the project within 20 days.

TABLE 21

Activity	Cost per Day of Reducing Duration of Activity ($)	Maximum Possible Reduction in Duration of Activity (Days)
Foundation	30	2
Walls and ceiling	15	3
Roof	20	1
Electrical wiring	40	2
Windows	20	2
Siding	30	3
Paint	40	1

Answer rating: 100% (QA)

Solution Pooblem no 3 Sal Gven foom the data immedtate Dusccton PooceS Cday... View the full answer