A couple are planning their dream house. The plans show the size of the house to be 2,000 square feet. The average price for a lot and house similar to this one has been $250 per square foot. Fortunately, their son is a plumber and they can save money by installing the plumbing themselves. They believe they can complete the exterior painting with the help of their two sons. The following average cost information is available: Exterior Excavation & foundation Windows & siding Paving and walkways 11% 12% 2% 5% Exterior painting Interior Framing 15% Electrical wiring etc. 6% Plumbing roughed in 6% HVAC & furnace 12% Drywall & Plaster 10% 6% 4% 4% 7% Interior painting Plumbing fixtures Light fixtures Flooring a) What is the estimated cost for the house if they use contractors to complete all of the house? b) Estimate what the cost of the house would be if they do some of the work themselves (ignore the cost of supplies). c) If the contractor hires labourers at $45/hour, with an overhead of 25%, what are the direct costs of labor and the total direct costs for a labourer? d) Draw a work breakdown structure for this project (use breakdown categories that make sense)