Solve the Problem $f ( t ) = 0.008 t ^ { 2 } + 2.1 t + 175$

Multiple Choice

Solve the problem.
-The population of a certain country since 1990 can be approximated by $f ( t ) = 0.008 t ^ { 2 } + 2.1 t + 175$ where $f ( t )$ is the population in millions and $t$ represents the number of years since 1990 . Find the average rate of change in the country's population between 1990 and 2010 . Round to 1 decimal place.

A) $2.3$ million/yr
B) $2.0$ million/yr
C) $2.5$ million $/ \mathrm { yr }$
D) $2.9 \mathrm { million } / \mathrm { yr }$