John has a job parking cars. he earns a fixed weekly salary of $160 plus a fee of $4 for each car he parks. his potential earnings for a week are shown in the graph. at what point does john begin to earn more from fees than his fixed salary? complete the justification of your answer. john earns the same in fees as his fixed salary when he parks $ ÷ $ fee per car = cars. he starts earning more from fees than his salary when he parks cars.