John Jr. remembered a method called the work breakdown structure (WBS) that he thought might serve as a useful tool to estimate costs. Also, the use of such a tool could be passed along to the site supervisor to help evaluate the performance of work crews. John Jr.'s WBS is shown in Table A. The total cost John Jr. calculated was $185.00, based on 12.33 labor-hours at $15.00/labor-hour. John Jr. found that, on average, Ringold's competitors charged $229.00 to install a similar pool. John Jr. thought he had a winner. He called his father and made an appointment to present his findings the next morning. Since he had never assembled a pool himself, he decided to increase the budget by 10 percent, "just in case." Questions is John Jr.'s WBS projection reasonable? What aspects of the decision will John Sr.consider? TABLEA Pool Installation WBS Works Tasks Labor-Hours (estimated) Prepare ground surface 2 67 Clear 1 Rake + Level 1 Sand bottom Lay out pool frame 2.50 Bottom ring 1 Side panels + Top ring 1 Add plastic liner 0.50 1 66 Assemble pool Build wooden support 300 1 Layout Assemble 2 Fill and tes! 2.00 Total 12 33