A project involving 30 manholes to be built in the city of Riyadh. The dimensions of a manhole are shown in the figure below. You are interested in bidding for this project. You will, hopefully, prepare a detailed estimate for the purpose of submitting a bid. Your bid should reflect the direct cost, overhead (including job and office overheads), contingency, and profit. (35 Points) Note: The mark will totally depend on the method of estimate and the obtained results. a. DETERMINE, first, the total direct cost for this project (25 Points) b. Then, verbally, EXPLAIN, how you will account for job overhead and office overhead. (5 Points) c. Finally, LIST five factors that might influence your decision on the profit size. (5 Points) The following data are available to you: Material Concrete Price (4500 psi delivered) SR/m Forms 15 SR/SMCA Form Ties (placed every one meter along the 20 SR/each Reinforced Steel 3000 SR/ton Scaffolding for top slab 35 SR/m Wales) Labor Carpenter's Wage 25 SR/hr 30 SR/hr 12 SR/hr Steel Worker's Wage Unskilled labor Wage Concrete Worker's Wage 20 SR/hr Machine Backhoe (Owning and Operating Cost) 75 SR/hr Productivity Data Carpentry work (one carpenter and one helper) Form fabrication 4 m/hr Form erection 8 m/hr 20 m/hr Form stripping 250 Form erection Form stripping Steel Worker (two steel workers and one helper) Steel placement 0.9 ton/hr Concrete Work (two concrete workers) Concrete placement 3 m/hr Earth Work 10 2.0M Excavation (backhoe and one helper) Backfilling and compaction around and at the top of the manhole (one unskilled worker) 4.5 m/hr 25mm 18mm 012mm@20cm 18cm 40 CM 8 m/hr 20 m/hr SECTION - SECTION C-C 12cm 020mm 30 cm centers SOCM+ 2.78 M 30M >6012mm 3.5 m/hr Sab 14mm@15cm 301 SECTIONA Diameter Om W. KgLM 12 0.888 14 1.210 16 1.580 20 2470