You are the buyer for your university bookstore. One of the textbooks has a cost to you of $150 and you sell it to students for $300. In this case, however, you cannot salvage any value from copies that do not sell because a new edition is published every semester. Demand for this text averages 130 copies each semester, with a standard deviation of 20 copies. Use Appendix A.
How many should you order each semester? (Round your intermediate calculations to 2 decimal places and final answer to the nearest whole number.)