The formula below gives t, the approximate time in years it takes a population to double if the annual growth rate is r percent.

t=70/r

according to this formula, about how long will it take a population to double if the annual growth rate is 3.2%?

hint: do not convert the growth rate to a decimal before dividing.

a. 22 years
b. 26 years
c. 18 years
d. 30 years

I believe it is 22 years. 
Again, math questions do not go in the spanish field:)

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