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6 January, 08:36

Pennies used to be made of copper and zinc and had a mass of 3.1g today pennies are made of copper plated zinc and have a mass of 2.5 G. A new pennies mass is what percent of an old pennies mass?

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  1. 6 January, 09:39
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    2.5/3.1 = 0.806451612903226 %
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