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Three CD’s are bought at an average cost of $15 each. If a fourth CD is purchased, the average cost becomes $16. What is the cost of the fourth CD?

 Jun 9, 2020
 #1
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Average of 3    =  $ 15

so price is   3*15 = $ 45     then add   x

 

3*15   + x              and divide by 4 to get the average = $ 16

 

(3*15 +x)/4 = 16 

   solve for x = $ 19

 Jun 9, 2020

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