Tim's cat bit him.  He decided to get himself and the cat checked out.  His doctor's visits $300 and insurance covered 75%.  His cat's visit cost $120 and his pet insurance covered $60.  How much did he pay?
The insurance covers 300*.75=$<T>multiply(300, 0.75)=225.0
So he had to pay 300-225=$<T>subtract(300, 225)=75
The cats visit cost 120-60=$<T>subtract(120, 60)=60
So in total he paid 75+60=$<T>add(75, 60)=135
