Kim needed to fill up her trucks gasoline tank and gasoline costs $3.75 per gallon. if she paid $56.85, how many gallons of gas did she purchase?

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.