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What is the width of the wall space without the door in
Figure 9-5?
Figure 9-5

1. A furnace flue is made from four pieces of pipe. After
they are fitted together, each piece of flue pipe is 1 foot 10½ inches long.
What is the total length of the flue?
2. A wiring job requires 43 feet 3 inches of electrical
metallic tubing (EMT). If the EMT is available in 10-foot lengths, how many
pieces are needed, and how much is left over of the last piece?

In Figure 9-6, how many feet and inches is it from the left
end of the building to the centerline of the window?
Figure 9-6

1. How wide must insulation be to wrap around an 8-inch
square duct?
2. How wide must insulation be to wrap around an
8-inch-diameter round duct? Round to one decimal place.
3. What is the perimeter of a rectangular building lot that
is 80 feet wide and 140 feet deep?

1. It is estimated that 2,550 square feet of decking is
needed for a roof. If an additional 20% is added for waste, what is the total
amount required?
2. The total area to be covered with oriented strand board
(OSB) is 1,250 square feet. How much should be ordered if 8% is added for
cutting and waste?

1. In constructing a building, 2% of the total cost is
allowed for excavation. What is the total cost of the building if the
excavation costs $2,825?
2. In making mortar, lime is used in an amount equal to 12%
of the cement. How much lime is necessary if 995 pounds of cement is used?

1. If 65 square feet of copper flashing is needed for a
particular job and 20% is to be added for waste, how much should be ordered?
2. The total cost of building a house is $146,000. What
percentage is spent on excavation, foundation, and framing if these costs are
$72,275?

1. A dealer buys an item at a cost of 6,600 and sells it for
a profit of 12% of the cost. Find the amount of profit and the selling price.
(Note: selling price 5 cost 1 profit.)
2. A contractor makes $18,000 profit on a job. If the profit
is 12% of the total, what does the owner pay?

1. The grading on a $145,500 job is $2,182.50. What
percentage of the total cost is the grading?
2. A project has actual costs of $3,464.00. If the
contractor adds 15% for overhead and 18% of the cost for profit, what will be
the total cost charged to the customer?

1. A person pays 7% simple interest on a $140,000
construction loan. What is the interest paid in the first year of the loan?
2. A builder buys equipment on credit for $44,250, and the
interest rate is 9% per year. What is the interest payment for the first year?