It depends on the year each penny was struck, or made. Pre-1982 pennies weigh 3.11 grams ( 0.109 702 021 66 ounce) because they are made of solid copper. Post-1982 pennies weigh 2.5 grams (0.088 184 904 874 ounce) because they are made of zinc covered with a thin layer of copper. The cash value of 68 pounds of pennies is somewhere between $99.17 and $123.37 (99 dollars, 17 cents and 123 dollars, 37 cents).
Post-1982 pennies are only worth face value, while pre-1982 pennies are technically worth 2 cents in copper content, but since it is illegal to melt or export them without a permit, there are few buyers for copper cents above face value.
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That makes $87.09. One penny weighs 2.5 grams, with 453.59 grams per pound, making 181.44 pennies per pound, times 48 is 8,709 pennies.
If the pennies are 1982 or newer it would be 126.70 if older then 1982 it would be 103.60 so a mix of older and newer would be between the two