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Let $P_1$ and $P_2$ be the populations (in hundreds) of Town 1 and Town 2, respectively. The table below shows data for these two populations for five different years.

Year	1980	1983	1985	1991	1998
$P_1$	54	58	62	66	70
$P_2$	89	84	79	74	69

Find the average rate of change of each population over each of the time intervals below.

(a) From 1980 to 1985, the average rate of change of the population of Town 1 was hundred people per year, and the average rate of change of the population of Town 2 was hundred people per year.

(b) From 1985 to 1998, the average rate of change of the population of Town 1 was hundred people per year, and the average rate of change of the population of Town 2 was hundred people per year.

(c) From 1980 to 1998, the average rate of change of the population of Town 1 was hundred people per year, and the average rate of change of the population of Town 2 was hundred people per year.

You can earn partial credit on this problem.