Use the Information About Marginal Revenue (MR) That Is Presented

Multiple Choice

Use the information about marginal revenue (MR) that is presented in the table below to determine the level of output that maximizes total revenue.
$$\begin{array} { l r r r r r r r r r } \text { Output } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 \\M R & 50 & 40 & 30 & 20 & 10 & 0 & - 10 & - 20 & - 30\end{array}$$

A) 1
B) 6
C) 9
D) There is not enough information to determine the answer.