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**% copper in post-1982 pennies**

## Homework Statement

The total mass of each penny is 2.500g, the density of copper is 8.96g/ml, the density of zinc is 7.14g/ml and the mass of a penny if it was 100% copper would be 3.11g.

## Homework Equations

## The Attempt at a Solution

I am not too sure how to start this one. If someone could give me a boost I would appreciate it.