Chapter 0, Problem 40RE

Advertising The revenue $R(x)$

(in thousands of dollars) that a company receives from the sale of $x$ thousand units is given by $R(x)=5x-x^2$. The sales level $x$ is in turn a function $f(d)$ of the number $d$ of dollars spent on advertising, where

$f(d)=6\left(1-\frac{200}{d+200}\right)$

Express the revenue as a function of the amount spent on advertising.