Write the Word or Phrase That Best Completes Each Statement $\mathrm { N } = \mathrm { Ie } \mathrm { kt } , \mathrm { N }$

Multiple Choice

Write the word or phrase that best completes each statement or answers the question.
-In the formula $\mathrm { N } = \mathrm { Ie } \mathrm { kt } , \mathrm { N }$ is the number of items in terms of an initial population $\mathrm { I }$ at a given time $\mathrm { t }$ and $\mathrm { k }$ is a growth constant equal to the percent of growth per unit time. How long will it take for the population of a certain country to double if its annual growth rate is $7.5 \%$ ? Round to the nearest year.

A) $4 \mathrm { yr }$
B) $9 \mathrm { yr }$
C) $27 \mathrm { yr }$
D) $1 \mathrm { yr }$