1. A mail order houses uses 17000 boxes a year. carrying cost are $1 per box a year and ordering cost are $99. The following price schedule applies. Determine the number of order per year.

2. Assume based on PERT analysis, the critical path has expected duration of 21 days and variance of 4 days. Find the probability that project will be completed in less than 20 days.

3. A company that produces hair dryers buy some of the component, but it makes the heating element, which it can produce at the rate of 1300 per day. Hair dryers are assembled daily at a rate of 100 per day. What is the inventory level 4 days after start of production run assuming initial inventory is 200.

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