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21. A worker on a roof 30 ft. above the ground needs to lift a rectangular banner from the rud. When the work is done, the upper (shorter) edge of the banner is aligned with the edge of the roof and the banner hangs freely from the roof. The banner is 10 ft. by 30 ft. and has two ropes attached to the shorter side Each of the ropes weighs 4 pounds per foot; the banner weighs 5 pounds per square foot. How much work is required?
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