John rents his car out 10 times a month for 3 hours each time.  He gets paid $25 an hour.  If his car payment is $500, how much profit does he make on his car?
He rents his car 10*3=
<gadget id="calculator">10*3</gadget>
<output>30</output>
30 hour a month.
So he makes 25*30=$
<gadget id="calculator">25*30</gadget>
<output>750</output>
750 a month.
That means he has a profit of 750-500=$
<gadget id="calculator">750-500</gadget>
<output>250</output>
250 a month.

<result>250</result>