Can you provide an in-depth solution for: Mark's car breaks down and he needs to get a new radiator.  The cost for a new radiator is $400 but he goes to get it at a junk shop and gets it for 80% off.  He then hires a mechanic to install it and it takes 3 hours at $50 an hour.  How much did he pay?Hey there, could you help me solve this math problem: Mark's car breaks down and he needs to get a new radiator.  The cost for a new radiator is $400 but he goes to get it at a junk shop and gets it for 80% off.  He then hires a mechanic to install it and it takes 3 hours at $50 an hour.  How much did he pay?