\(\begin{array}{c|c}
\text{Price N} & \text{Quantity sold} \\
5 & 15 \\
5 & 16 \\
5 & 17 \\
5 & 18 \\
\end{array}\)
Marginal revenue is
\(\begin{array}{c|c}
\text{Price N} & \text{Quantity sold} \\
5 & 15 \\
5 & 16 \\
5 & 17 \\
5 & 18 \\
\end{array}\)
Marginal revenue is