SOLUTION: The output of a particular producing oil well decreases at the continuous rate of 12% per year. How long it will take for the output to fall to 1/5 of its present output?

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Question 863782: The output of a particular producing oil well decreases at the continuous rate of 12% per year. How long it will take for the output to fall to 1/5 of its present output?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
O%28t%29+=+O%5B0%5De%5E%28-rt+%29++
ln(.2)/-.12 = t = 13.412 years