A building has a 36′ x 40′ flat roof. If you use 15# felt that comes in 400sq. Ft. rolls that cost $20 each, what is the total cost of the felt if you apply 5 layers to the roof? Assume no waste, laps or overages.
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windy city oil field, karamay, xinjiang, China
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Laying plastic pipes drainage to drain the water around the house of drainage system
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