Mark collects money for the homeless.  He visits 20 households a day for 5 days and half of those households give him a pair of 20s.  How much did he collect?
He got money from 20/2=<T>divide(20, 2)=10.0 households per day
So that means he got money from 10*5=<T>multiply(10, 5)=50 households
Each of those houses gave 20*2=$<T>multiply(20, 2)=40
So he raised 40*50=$<T>multiply(40, 50)=2000
