3.3. The demand for any product is 1000 units per year. The cost of placing each order is $10; Annual storage costs are $2 each.

a) How much should I order this product?

b) Assume that if the order quantity is at least 500 units, each order receives a $100 discount. Should products be ordered in batches of 500 or should a) a) leave the decision made?

3.4. Product X is a standard product that is stored in a component warehouse used by the same company. Each year, the company uses a random sample of 2,000 X products, each costing $25. Maintaining one element of an average stock costs $5. Each subsequent purchase order for additional X items costs $10.

a) What should be the order quantity for product X?

b) Find the annual cost associated with ordering product X.

c) Find the annual cost of holding product X.

3.5. There are seven jobs, each of which consists of two - A and B. All seven operations are performed in the following order: first operation A, then operation B. Determine the optimal sequence of work if they are characterized by the following time costs.

Work	Time performing operation A	Time performing operation A
1 2 3 4 5 6 7	9 8 7 6 1 2 4	6 5 7 3 2 6 7