A music store marks its DVDs as A. B, or C to indicate one of three selling prices. The last column in the table shows the total cost of a purchase. Use this information to determine the cost of one DVD of each type by setting up a matrix equa- tion and solving it with an inverse.

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A | B 2 3 1 4 2 C 4 0 13 Total $120.91 $62.95 $79.94