You have purchased a VCR for $180. You also joined a video rental store where you can rent movies for $3 each.

Suppose that the cost of admission to a movie theater is $6.00. How many videos must you rent to make your average cost per video less than $6.00?

180 + 3x < 6x

x > 60

check: 60 movies: $360
vcr+60rentals: 180+180 = $360