A Country Has a Population of 287 Million in 2005 $e ^ { - .013t }$

A country has a population of 287 million in 2005. Assuming a growth rate of 1.3%, determine the function that expresses the population of the country t years after 2005.

A) P(t) = 287 $e ^ { - .013t }$
B) P(t) = 287 $e ^ { .013t }$
C) P(t) = 287 $e ^ { 1.3 t }$
D) P(t) = 287 $e ^ { - 1.3t }$
E) none of these