Tom rents a helicopter for 2 hours a day for 3 days.  It cost $75 an hour to rent.  How much did he pay?
He rented the helicopter for 2*3=
<gadget id="calculator">2*3</gadget>
<output>6</output>
6 hours.
So he paid 6*75=$
<gadget id="calculator">6*75</gadget>
<output>450</output>
450.

<result>450</result>