human
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 $250. How much did he pay when picking it up, in dollars?
assistant
How much did his old costume cost? ** It cost 250*.4=$<<250*.4=100>>100 more than his old costume
How much did his new costume cost? ** So it cost 250+100=$<<250+100=350>>350
How much did Jeff leave as a deposit? ** He left a 350*.1=$<<350*.1=35>>35 deposit
How much did Jeff pay when picking it up? ** So he had to pay 350-35=$<<350-35=315>>315
#### 315