Tom cannot afford a normal doctor, so he goes to a discount clinic that is 70% cheaper.   It takes two visits, though, instead of 1.   A normal doctor charges $200 for a visit.   How much money does he save?
Each of Tom's visits was 200*.7=$<T>multiply(200, 0.7)=140.0 cheaper
So he paid $200 - $140 = $<T>subtract(200, 140)=60 per visit
That means he paid $60 * 2 = $<T>multiply(60, 2)=120
So he saved $200 - $120 = $<T>subtract(200, 120)=80
