Jeff orders a Halloween costume.  He has to put in a 10% deposit and then pay the rest when he picks it up.  The costume is 40% more expensive than last year's costume, which cost $250.  How much did he pay when picking it up, in dollars?
It cost 250*.4=$<<250*.4=100>>100 more than his old costume
So it cost 250+100=$<<250+100=350>>350
He left a 350*.1=$<<350*.1=35>>35 deposit
So he had to pay 350-35=$<<350-35=315>>315
#### 315