A normal lemon tree produces 60 lemons per year.  Jim has specially engineered lemon trees that produce 50% more lemons per year.  He has a grove that is 50 trees by 30 trees.  How many lemons does he produce in 5 years?
Each tree produces 60*.5=<T>multiply(60, 0.5)=30.0 more lemons than normal
So they each produce 60+30=<T>add(60, 30)=90 lemons
He has 50*30=<T>multiply(50, 30)=1500 trees
So every year he produces 1500*90=<T>multiply(1500, 90)=135000 lemons
That means he produces 135000*5=<T>multiply(135000, 5)=675000
