Answer:
D: 48
Step-by-step explanation:
Daily cost of production; c(x) = 200 + 16x
when the number of complete products manufactured is 5, the cost is:
c(5) = 200 + 16(5)
   = 200 + 80
   = 280
c(5) = 280
When the number of complete products manufactured is 8, the cost is:
c(8) = 200 + 16(8)
   = 200 + 128
   = 128
c(8) = 328
Average rate of change = c(8) - c(5)
                    = 328 - 280
                    = 48
Thus, the average rate of change is 48.
