Chris bought 8 movies on DVD for $12 each and 4 movies on Blu-ray for $18 each. What is the average price he paid per movie?
He spent a total of 8 * $12 + 4 * $18 = $<<8*12+4*18=168>>168
He bought a total of 8 + 4 = <<8+4=12>>12 movies.
The average price is $168 / 12 = $<<168/12=14>>14 per movie.
#### 14