Kristin spent $131 on shirts. fancy shirts cost $28 and plain shirts cost $15. if she bought a total of 7 shirts then how many of each kind did she buy?

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.