Which of the following statements about the mean is not always correct?

A) The sum of the deviations from the mean is zero.
B) Half of the observations are on either side of the mean.
C) The mean is a measure of the central location.
D) The value of the mean times the number of observations equals the sum of all observations.

Jane is paying $506 per month for a car over five years. She had a down payment of $6,000, and is paying interest at 4.8% compounded quarterly. What was the purchase price of the car? How much interest will Jane pay overall?