John has a large water collection tank.  The tank can hold 200 gallons.  It weighs 80 pounds empty.  A rainstorm fills it to 80% of capacity.  If a gallon of water weighs 8 pounds, how much does it weigh now?
The tank has 200*.8=<<200*.8=160>>160 gallons of water in it
That water weighs 160*8=<<160*8=1280>>1280 pounds
So in total it weighs 1280+80=<<1280+80=1360>>1360 pounds
#### 1360