i am stuck on this problem. i need both parts a and b done. please include all work in the answers. here is a pic of the problem

http://imgur.com/8qJDfj5

thanks in advance

Average rate of change from 1 to 2 = (480-300)/(2-1) =180

Average rate of change from 2 to 3 = (600-480)/(3-2) =120

Average rate of change from 3 to 4 = (700-600)/(4-3) =180

The average rate of change decreases. Sales show a diminishing return. It does not imply the more you advertise, the more sales will be.

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