hs.neolms.com/student_lesson/sho Unit 6 6.14 Floors And Plumbing Instructions tiles along the length and width.) Plumbing repairs can be expensive, and if not done properly other damages can occur. It is important to hire a plumber or plumbing company that will guarantee the work. 4. Gina Martin hired a plumber to fix four clogged drains. The basic service charge was $42 for the first hour The cost for additional time was $9.50 per 15 minutes. If the job took 1-12 hours, what was the cost? 5. Joy and Mark Jacobs hired a plumber to replace a drain and install a new garbage disposal. The plumber worked 1-3/4 hours, and charged $98.20 for parts. What was the total cost? (Use the rates from Exercise 4.)