A greeting card company has $325$ boxes of a particular card in Warehouse I and $300$

boxes of the same card in Warehouse II$.$ A greeting card shop in Whistler orders $200$

boxes of this card and another shop in Kelowna orders $250$ boxes. The shipping costs

per box to these two shops from the two warehouses are shown in the table below.

Using the "method of corners", determine how many boxes should be shipped to each

city from each warehouse to minimize the shipping costs. What is the minimum cost?