Chuck breeds dogs.  He has 3 pregnant dogs.  They each give birth to 4 puppies.  Each puppy needs 2 shots and each shot costs $5.  How much did the shots cost?
He has 3*4=<<3*4=12>>12 puppies
So they need 12*2=<<12*2=24>>24 shots
That means the vaccines cost 24*5=$<<24*5=120>>120
#### 120