The answer depends on a gallon of what, as well as where in the world.
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a quart of pennies is $11 so a gallon = $44
The answer will depend on whether you mean UK pennies and the Imperial gallon or US pennies (which are actually cents) and a measure that is a smaller gallon, or a penny from some other country and yet another arbitrary measure which is called a gallon!
About 181 pennies per pound.
320,000
2,478 pennies :) science fair project once