For their grand opening, Super Sound had special prices on their CDs, their DVD movies, and their videocassettes. Joshua bought 4 CDs, 1 DVD movie, and 2 videocassettes for a total cost of $47. Shilpa bought 3 CDs, 2 DVD movies, and 1 videocassette for a total cost of $45.
(a) From this information, can you find the sale price of each item? Why?
(b) A little later, Lilia bought 1 CD, 3 DVD movies, and 1 videocassette for a total cost of $46. Using the information of the three customers, can you find the cost of each item?
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