John started weightlifting when he was 16.  When he first started he could Clean & Jerk 80 kg and he could Snatch 50 kg.  He manages to double his clean and jerk and increase his snatch by 80%.  What is his new combined total lifting capacity?
His clean and jerk goes to 80*2=<T>multiply(80, 2)=160 kg
His snatch increases by 50*.8=<T>multiply(50, 0.8)=40.0 kg
So his snatch is now 50+40=<T>add(50, 40)=90 kg
So his total is 160+90=<T>add(160, 90)=250 kg
