Mark needs to replace the radiator in his car.  The work takes 2 hours and the mechanic charges $75 an hour.  The part cost $150.  How much did he pay?
He had to pay for 2 hours of labor, which cost 2*$75=$
<gadget id="calculator">2*75</gadget>
<output>150</output>
150.
So the total cost was $150+$150=$
<gadget id="calculator">150+150</gadget>
<output>300</output>
300.

<result>300</result>