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 $250.  How much did he pay when picking it up, in dollars?
It cost 250*.4=$
<gadget id="calculator">250*.4</gadget>
<output>100</output>
100 more than his old costume.
So it cost 250+100=$
<gadget id="calculator">250+100</gadget>
<output>350</output>
350.
He left a 350*.1=$
<gadget id="calculator">350*.1</gadget>
<output>35</output>
35 deposit.
So he had to pay 350-35=$
<gadget id="calculator">350-35</gadget>
<output>315</output>
315.

<result>315</result>