The cost to park a car in a certain parking garage is $10.00 for up to 2 hours of parking and $1.75 for each hour in excess of 2 hours. What is the average (arithmetic mean) cost per hour to park a car in the parking garage for 9 hours?  Choices.
A) $1.09
B) $1.67
C) $2.225
D) $2.47
E) $2.50
Total cost of parking for 10 hours = 10$ for the first 2 hours and then 1.75 for (9-2) hours = 10+7*1.75= 
<gadget id="calculator">10+7*1.75</gadget>
<output>22.25</output>
22.25   Thus the AVERAGE parking price= 22.25/9 = 2.47 $   $2.47 is the correct answer.
<result>D</result>
The cost to park a car in a certain parking garage is $10.00 for up to 2 hours of parking and $1.75 for each hour in excess of 2 hours. What is the average (arithmetic mean) cost per hour to park a car in the parking garage for 9 hours?