Mr. Sean has a veterinary clinic where he charges clients $60 to treat a dog and $40 to care for a cat. If Khalil took 20 dogs and 60 cats to the clinic for treatment, how much money did he pay Mr. Sean?
To treat his 20 dogs, Mr. Sean charged Khalil 20*$60 = $<<20*60=1200>>1200
Khalil also paid $40*60 = $<<40*60=2400>>2400 to Mr. Sean to treat his cats.
Altogether, Khalil paid Mr. Sean $2400+$1200 = $<<2400+1200=3600>>3600 to treat his pets.
#### 3600