Marty’s plumbing charges a fixed dollar amount per hour plus a fix service fee per job felicia’s plumbing charges $10 less per hour than mommy’s plumbing but the fix service per job she charges is $10 more than marneys plumbing charges marty’s plumbing took five hours to complete felicia’s plumbing would also have taken five hours to complete the same dog compared to marty’s plumbing for uses plumbing would have charged