The marginal revenue is $MR = 30 - 2x$ rupees. What is the demand function, the price $p$ at which $x$ units sell?

Explanation

1. 01

   $R(x) = 30x - x^{2}$, and revenue = price × quantity.

2. 02

   So $p = \frac{R(x)}{x} = 30 - x$.