ABCComputer Company manufactures notebook computers. The economic lifetime of a particular model is only four to six months, which means that ABChas very little time to make adjustments in production capacity and supplier contracts over the production run. For a soon-to-be-introduced notebook, ABCmust negotiate a contract with a supplier of motherboards in advance of the start of the production run. At the time of contract negotiation, ABChas forecasted that demand for the new notebook is normally distributed with a mean of 10,000 units and a standard deviation of 2,500 units. The net profit from a notebook sale is $500 (note that this already includes the cost of the motherboard, as well as all other material, production, and shipping costs). Motherboards cost $200 and have no salvage value (i.e., if they are not used for this particular model of notebook, they will have to be written off). 

a. Use the news vendor model to compute a purchase quantity of motherboards that balances the cost of lost sales and the cost of excess material. 

b. Comment on the appropriateness of the news vendor model for this capacity planning situation. What factors are not considered that might be important?