James buys a weight vest for $250.  He then buys 200 pounds of weight plates for $1.2 per pound.  A 200-pound weight vest would cost $700 but there is a $100 discount.  How much does he save with his vest?
The weight plates cost 200*1.2=$<T>multiply(200, 1.2)=240.0
So his vest cost 250+240=$<T>add(250, 240)=490
He could get the other vest for 700-100=$<T>subtract(700, 100)=600
So he saved 600-490=$<T>subtract(600, 490)=110
