The Winston Company has four distribution centers (A, B, C, and D) that require 40,000, 60,000, 30,000, and 50,000 gallons of de-ionized water, respectively, per month for cleaning their long-haul trucks. Three de-ionized water wholesalers (1, 2, and 3) indicated their willingness to supply as many as 50,000, 70,000, and 60,000 gallons, respectively. The total cost (shipping plus price) of delivering 1,000 gallons of de-ionized water from each wholesaler to each distribution center is shown in the following table:

a. Determine the optimal solution. Show that all capacities have been exhausted and that all demands can be met with this solution.
b. What is the total cost of thesolution?

Distribution Center WholesalerA $1.30 $1.40 $1.80 $1.60 $1.30 $1.50$1.80$1.60 $1.60 $1.40$1.70 $1.50