Contractors Bid On Jobs
Posted in Phoenix Contractors on 08/19/2011 02:43 pm by admin
Please I need some help with this math question?
An engineer’s plan shows a canal with a trapezoidal cross section that is 8 ft deep and 14 ft across at the bottom with walls sloping outward at an angle of 45°. The canal is 620 ft long. A contractor bidding on the job estimates the cost to excavate the canal at $175/yd3. If the contractor adds 10% profit, what should the bid be?
Please help me complete this, im so confused.
Bid price = Cost of job*1.1 (to include profit).
Cost of job = $175*Volume to be excavated in cubic feet / 27
(Divide by 27 because 1 cubic yard = 27 cubic feet.)
Volume in cubic feet = Area of cross-section*Length = Area*620
Area of cross section = Height*(Top width + bottom width) / 2
Top width = Bottom width + 2*Height.
(Look at a diagram to convince yourself that this is true.)
Can you work it out with that help? It will do you a lot more good than copying someone else’s answer. (Hint – start the working with the last line and work upwards.)
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