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A 180-lb man carries a 5-lb can of paint up a helical staircase that encircles a silo with radius 25 ft.

A 180-lb man carries a 5-lb can of paint up a helical staircase that encircles a silo with radius 25 ft. If the silo is 80 ft high and the man makes exactly four complete revolutions, how much work is done by the man against gravity in climbing to the top?

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