lara's car needed a particular part that cost $75. the mechanic charges $50 per hour to install the part. if the total cost was $350, how many hours did it take to install the part?
Subtract $350-$75 (Which is the cost of the part) , that will be $275, then divide $275 by $50 (amount requested per hour), and that is equal to 5.5 So, it took 5.5 hours to install the part.
