Paul's plumbing charges a flat fee of $90 plus $40/h for plumbing job. perfect pipes charges a flat fee of $60 plus $55/h for a plumbing job. a) write the expressions to represent the total costs of a plumbing job each for company. let "h" represent the time, in hours, of a plumbing job. b) is the cost of a 3- hour-long plumbing job the same at both companies? write and use an equation to find out.