Question: From 1 9 6 2 until 1 9 8 1 , the US cent coin was made of copper ( 9 5 % ) and

From 1962 until 1981, the US cent coin was made of copper (95%) and zinc (5%). These pennies have a density of 8.85 g/cm3. After 1982, the US mint changed the composition of the cent coin to zinc (97.5%) and copper (2.5%). These pennies have a density of 7.185 g/cm3.

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