human
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?
assistant
How much did the mechanic charge? ** He had to pay for 2 hours of labor, which cost 2*$75=$<<2*75=150>>150
How much did Mark pay? ** So the total cost was $150+$150=$<<150+150=300>>300
#### 300