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200 lb man carries a 25 lb can of paint up a helical staircase that encircles a silo with radius 25 ft. The silo is 120 ft high and the man makes exactly four complete revolutions. Suppose there is a hole in the can of paint and 18 lb of paint leaks steadily out of the can during the man's ascent. How much work is done by the man against gravity in climbing to the top?

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