human
John buys 20 hours of music a month. The average length of a song is 3 minutes. He buys each song for $.50. How much does he pay for music a year?
assistant
How many minutes of music does John buy in a month? ** He buys 20*60=<<20*60=1200>>1200 minutes of music a month
How many songs does John buy in a month? ** So that is 1200/3=<<1200/3=400>>400 songs
How much does John pay for music a month? ** That means he pays 400*.5=$<<400*.5=200>>200 a month
How much does John pay for music a year? ** So it comes out to 200*12=$<<200*12=2400>>2400 a year
#### 2400