The total cost (in dollars) of producing x coffee machines is C(x)=2200+30x−0.8x2.
The total cost (in dollars) of producing x coffee machines is
C(x)=2200+30x−0.8x2.
(A) Find the exact cost of producing the 21st machine.
Exact cost of 21st machine =
(B) Use marginal cost to approximate the cost of producing the 21st machine.
Approx.cost of 21st machine =