Maths

Steve - you answered this question earlier for someone else and gave them the formula for how to answer it. I have the same problem in my homework and have used the formula you gave, but have got an answer that does not appear in the answer options.
I got 12.75
Would you be able to show your workings and help me to get the correct answer please?

the population growing at an annual rate r will triple in a time t given by the formula t = ln 3/r If the growth rate remains constant and equals 9% per year, how long will it take the population of the town to triple?
a. 6 . 6 years
b. 1 years
c. 5 . 3 years
d. 2 . 2 years
e. 12.2 years

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  1. done

    http://www.jiskha.com/display.cgi?id=1467924046

    You might check your previous posts before wasting everyone's time posting it all over again...

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