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02-10-2020
Chemistry

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QUICK AND EASY, NO COMPLICATED PROBLEM!

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 2.5g. A new penny's mass is what percent of an old penny's mass?

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02-10-2020

Answer:

81%

Explanation:

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