Average change

Problem:

The value of a car changed by -$4,510, -$3,866, -$2,830, -$2,125, -$2, 030, and -$1,964 over 6 years. What is the average change per year?

Solution:

Just compute the average of these numbers, we have

$\frac{(-4510) + (-3866) + (-2830) + (-2125) + (-2030) + (-1964) }{6} = \frac{-17325}{6} = -2887.5$