Chapter 6.2, Problem 39SR

To determine

To find the number of clicks on the advertisement.

Answer to Problem 39SR

At least 700 clicks are needed to get $45 or more per month.

Explanation of Solution

Given:

The website earns $10 per month and $0.05 each time a visitor clicks on the advertisement.

Calculation:

Let $x$ be the number of clicks on the advertisement that is needed to get $45 or more per month.

Then according to given data, we get

  $\begin{array}{l}10+0.05x\ge 45\\ \Rightarrow 0.05x\ge 45-10\\ \Rightarrow 0.05x\ge 35\\ \Rightarrow x\ge \frac{35}{0.05}\\ \Rightarrow x\ge 700\end{array}$

Hence at least 700 clicks are needed to get $45 or more per month.