<human>:  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?
<bot>: How much did Chris spend? ** He spent a total of 8 * $12 + 4 * $18 = $<<8*12+4*18=168>>168
How many movies did Chris buy? ** He bought a total of 8 + 4 = <<8+4=12>>12 movies.
What is the average price Chris paid per movie? ** The average price is $168 / 12 = $<<168/12=14>>14 per movie.
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