Hi

buy 12 discs

Let x and (12-x)represent the number of disk costing 11.50 and 7.50 respectively

Question states***

 11.50x + 7.50(12-x) = $106

             4x = $106 - 7.50*12

             4x = $106 - 90

             4x = 16

              x = 4, the number of disk costing 11.50



CHECKING our Answer

  4*$11.50 + 8*$7.50 = $106

  

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