SOLUTION: The half-life of a certain substance is 27. How long will it take for a sample of this substances to decay to 88% of it original amount? Use exponential decay model to solve. {{{A=

Question 857664: The half-life of a certain substance is 27. How long will it take for a sample of this substances to decay to 88% of it original amount? Use exponential decay model to solve.
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
Stating the time units for the half-life would be a good thing to do.

A quantity, I, of the substance drops to I/2 in 27 times units:
---simply plugged-in the values about the half life...

-
The value in decimalized form for k is .

Now your question is, for ?

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..
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