Solve the Problem $\mathrm{P}(\mathrm{t})$ , in Millions, Tyears After 2010 Can Be Approximated By Millions

Multiple Choice

Solve the problem.
-A certain country's population $\mathrm{P}(\mathrm{t})$ , in millions, tyears after 2010 can be approximated by $\mathrm{P}(\mathrm{t}) =3.495(1.018) ^{\mathrm{t}}$ .
Find the doubling time. Round your answer to the nearest tenth.

A) $38.9 \mathrm{yr}$
B) $61.6 \mathrm{yr}$
C) $77.7 \mathrm{yr}$
D) $70.1 \mathrm{yr}$