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