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A certain element decays at a constant rate of 6% per year. If you start with 20 grams of the element, how long will it

A certain element decays at a constant rate of 6% per year.

If you start with 20 grams of the element, how long will it take before there are only four grams left?

a.) 26.6years
b.) 27.6years
c.) 26.0years
d.) 25.0years

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