Question 15

Slack in PERT/CPM is the length of time an activity can be

• delayed without increasing the project cost.
• delayed with the increase of the project completion time.
• delayed with the increase of the project cost.
• delayed without increasing the project completion time.
• None of the above.

Question 16

In the Inventory models, the holding costs are expenses incurred during

• the oversupply of items.
• the transportation of items.
• the shortage of items.
• the storage of items.
• None of the above.

Question 17

Daniela's Coffee Shop blends coffee on the premises for its customers. It sells two basic blends in one pound bags: Mountain Dark, and Daniela's Specialty. It uses three different types of coffee to produce the blends, Brazilian, Mocha, and Colombian. The shop uses the following blend recipe requirements.

Blend	Selling Price ($$/kg)	Mix Requirements
Mountain Dark	12.50	at least 60%60% Brazilian; no more than 20%20%Mocha
Daniela's Specialty	9.00	no more than 40%40% Colombian

The cost of Brazilian coffee is $4.00/kg, the cost of Mocha coffee is $5.50/kg, and the cost of Colombian is $6.00/kg. The shop has 80 kg of Colombian, 110 kg of Brazilian, and 70 kg of Mocha. The shop wants to know how much of each blend to prepare each week in order to maximize profit. The LP model for the problem contains

• 8 decision variables.
• 5 decision variables.
• 4 decision variables.
• 6 decision variables.
• None of the above.