# Math Help - Posting 2nd time(1st time didnt get anyhelp)

1. ## Posting 2nd time(1st time didnt get anyhelp)

A company knows that unit cost C and unit revenue R from the production and sale of x units are related by C = ((R^2)/(182000)) + 8033 . Find the rate of change of revenue per unit when the cost per unit changing by $11 and the revenueis$ 4000.

2. Originally Posted by ArmiAldi
A company knows that unit cost C and unit revenue R from the production and sale of x units are related by C = ((R^2)/(182000)) + 8033 . Find the rate of change of revenue per unit when the cost per unit changing by $11 and the revenueis$ 4000.
You want to find: $\frac{dR}{dx}$,

we start by differentiating $C$ with respect to $x$:

$\frac{dC}{dx} = \frac{d}{dx}\left[\frac{R^2}{182000} + 8033 \right]=\frac{R}{91000}\frac{dR}{dx}$

Now you want $\frac{dR}{dx}$ when $\frac{dC}{dx}=11$ and $R=4000$. Plug these into the above equation and solve for $\frac{dR}{dx}$.

RonL