The Rate of U $Q ( t ) = 0.05 t ^ { 2 } + 0.4 t + 9$

Multiple Choice

The rate of U.S. per capita sales of bottled water for the period 1993-2003 could be approximated by $Q ( t ) = 0.05 t ^ { 2 } + 0.4 t + 9$ where t is the time in years since 1990.
Compute the average annual sales of bottled water over the period 1996-2003, to the nearest gallon per year.

A) 16 gallons per year
B) 15 gallons per year
C) 17 gallons per year
D) 18 gallons per year
E) 19 gallons per year