For this, we will be using dimensional analysis as such:

In short, 24,900 miles is 40,072,665.6 (40,072,666 if rounded to the whole meter) meters.
9-n would be the proper equation
69 is the width. hoped this help! :)
For this case we must solve the following equation:

To solve we follow the steps below:
We square both sides of the equation squared:

We choose the positive value because we talk about $. 
Answer:
$6