What Is the Marginal Revenue of Producing the Third Unit

Multiple Choice

What is the marginal revenue of producing the third unit?

$\begin{array} { c c c } \text { No. Units Produced } & \text { Total Revenue } & \text {Total Costs } \\0 & 0 & 0 \\ 1 & 100 & 50 \\ 2 & 180 & 110 \\ 3 & 250 & 180 \\ 4 & 290 & 270 \\ 5 & 310 & 380 \end{array}$

A) 250
B) 70
C) 0
D) 90