申論題

2. John Smith, the owner of Smith's Perfume Shop, expects to sell 800 bottles of a certain brand of perfume this year. The perfume costs $20 per bottle, the ordering fee is $10 per shipment, and the cost of storing the perfume is 40 cents per bottle per year. The perfume is sold at a constant rate throughout the year, and each shipment arrives just as the preceding shipment is being used up.

b. How often should Smith order the perfume? (5 points)