Find the value of this:

What is the approximate circumference of the circle shown below?

Pyotr tchaikovsky sporting goods operates on a 45% overhead based on the selling price, which results in an overhead of $65.34 on the newest version of an air hockey game set. if the air hockey game set costs pyotr tchaikovsky sports $49.32, find the selling price, the markup, and the net profit.

Hi, can anyone show me how to do this problem? 100 points for this. in advance