Dave was exploring coral 3 ft below sea level. then he swamto an underwater cave with an entrance 15 ft below sea level what is the difference and depth between the cave entrance and the coral

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.