Solve the Problem $\begin{array} { l } R ( x ) = 2 x \\G ( x ) = 0.01 x ^ { 2 } + 0.9 x + 40\end{array}$

Multiple Choice

Solve the problem.
-Find the number of units that must be produced and sold in order to yield the maximum profit, given the follow equations for revenue and cost:
$\begin{array} { l } R ( x ) = 2 x \\G ( x ) = 0.01 x ^ { 2 } + 0.9 x + 40\end{array}$

A) 55 units
B) 145 units
C) 110 units
D) 290 units