The Revenue Derived from the Production of X Units of a Particular

Multiple Choice

The revenue derived from the production of x units of a particular commodity is $R ( x ) = \frac { 80 x - x ^ { 2 } } { x ^ { 2 } + 80 }$ million dollars.What level of production results in maximum revenue? What is the maximum revenue? Round numbers to two decimal places,if necessary.

A) Maximum at x = 8 and maximum revenue is R(8) = 4 (million dollars)
B) Maximum at x = 8 and maximum revenue is R(8) = 32 (million dollars)
C) Maximum at x = 9 and maximum revenue is R(9) = 2.67 (million dollars)
D) Maximum at x = 8 and maximum revenue is R(8) = 2.67 (thousand dollars)