SOLUTION: a video store charges non-members $4 to rent a video. A store membership costs $21 but members pay only $2.50 to rent each video. How many videos do you need to rent for the cost o

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Question 699329: a video store charges non-members $4 to rent a video. A store membership costs $21 but members pay only $2.50 to rent each video. How many videos do you need to rent for the cost of videos to be the same for members and non-members?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +x+ = number of videos to be rented
Let +C+ = cost of renting videos
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For non-members:
+C+=+4x+
For members:
+C+=+21+%2B+2.5x+
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Set the cost equal to each other
+4x+=+21+%2B+2.5x+
+1.5x+=+21+
+x+=+14+
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When 14 videos are rented, the costs are the same