Question 6 (20 marks) ST & Partners (ST) is an architect firm that provides professional services to clients including building design, structuring engineering and project management. The firm's costing system includes only labor and overhead costs. ST categorized its labor cost into professional' and back-oflice support'. These labor costs are allocated to projects on the basis of hours worked by the professional and back-office staff according to the respective labor rates. The allocation base of overheads to projects is total labor hours worked. In order to better evaluate the profitability of each service project, the firm is considering to allocate overheads. The following overhead activities, cost drivers and budgets are established Cost Pool Cost Driver Overhead Budget 500,000 220,000 450,000 Number of draft of proposal Project initiation Planning Execution and monitoring Number of site visit Back-office support labor hours $2,000,000 $ 800,000 Professional labor cost Back-office labor cost Professional labor hour Back-office labor hour Number of draft of proposal Number of planning meeting Number of site visit 3,200 hrs 5,000 hrs 400 800 1,200 The following are data relating to two project completed by ST