遗憾

由于本人买comm225书时没注意，太相信别人，买书时看也没看被骗买了一本完全不同作者写的书，如今，assignment要做课本上的题目，望哪位能把书借我看一下，或者把题目email给我，题目是comm225课本（不是红书）page203 #18
blackshade2002@yahoo.com
万分感谢！！！! !

valentinelily

the two-rivers oil company near pittsburgh transports gasoline to its distributors by truck. The company has recently contracted to supply gasoline distributors in southern Ohio, and it has $600,000 available to spend on the necessay expansion of its fleet of gasoline tank trucks. Three models of gasoline tank trucks are availalbe.
Truck         
capacity  Purchase Mthly operating
model         (gallons) cost     cost, including
                                 depreciation
superTanker   5000     $67,000    $550
Regular Line  2500     $55,000    $425
Econo tranker 1000     $46,000    $350

The company estimates that the monthly demand for the region will be 550,000 gallons of gasoline. Because of the size and speed differences of the trucks, the number of deliveries or round trips possible per month for each truck model will vary. Trip capacities are estimated at 15 trips per month for the Super Tanker, 20 trips per month for the Regular LIne, and 25 trips per month for the Econo-Tanker. Based on maintenance and driver availability, the firm does not want to add more than 15 new vehicles to its fleet. In addition, the company has decided to purchase at least three of the new Econo-tankers for use on short-run, low-demand routes. As a final constraint, the company does not want more than half the new models to be Super Tankers.

a. If the company wishes to satisfy the gasoline demand with a minimum monthly operating expense, how many models of each truck should be purchased?

b. If the company did not require at least three Econo_tankers and did not limit the number of super tankers to at most half the new models, how many models of each truck should be purchased?

Why not copy it from yr classmate for later works?

遗憾

真是万分感谢！！！
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