John can front squat 80% as much as he back squats.  He used to back squat 200 kg but increased that by 50 kg.  He can do a triple equal to 90% of the amount he front squats.  How much weight will he move if he does three triples?
He increased his back squat to 200+50=<T>add(200, 50)=250 kg
That means his front squat is 250*.8=<T>multiply(250, 0.8)=200.0 kg
So he can do a triple with 200*.9=<T>multiply(200, 0.9)=180.0 kg
So he moves 180*3 = <T>multiply(180, 3)=540 kg if he does three triples
