Solve
-Use the Formula $\mathrm{N}=\mathrm{Ie}$ $\mathrm{kt}$ , Where $\mathrm{N}$ Is the Number of Items at Time

Multiple Choice

Solve.
-Use the formula $\mathrm{N}=\mathrm{Ie}$ , $\mathrm{kt}$ , where $\mathrm{N}$ is the number of items at time $\mathrm{t}$ , $\mathrm{I}$ is the initial amount, and $\mathrm{k}$ is a growth constant equal to the percent of growth (expressed in decimal form) per unit of time. There are currently 56 million cars in a certain country, increasing by $4.1 \%$ annually. How many years will it take for this country to have 78 million cars? Round to the nearest year.

A) $4 \mathrm{yr}$
B) $75 \mathrm{yr}$
C) $5 \mathrm{yr}$
D) $8 \mathrm{yr}$