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Volume of a roll of pennies = pi x r x r x h = 3.14 x .375" x .375" x 2.875" = 1.271 cu. in.
5 gallons = 0.668 cu. ft. or (x 1728) 1,154 cu. in.
1,154 / 1.271 = 908 rolls of pennies; worth $454; and weighing (@4.5 oz. ea.) 255 lbs.
Again, that's not accounting for any air in between the pennies, so I'd say $300 worth is in the realm of probability.
If you know what the empty jug weighs, you could weigh it; subtract the empty weight; and find the number of rolls (4.5 oz.) at 50 cents each.
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