Tom fills a 250 pound sandbag 80% full.  But the filling material he is using is 40% heavier than sand.  How much does the bag weigh?
The bag full of sand would weigh 250 * .8 = <<250*.8=200>>200 pounds
The filling material would make it 200 * .4 = <<200*.4=80>>80 pounds heavier
So it weighs 200 + 80 = <<200+80=280>>280 pounds
#### 280