154 / 200 show me that and decimals

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.

When 142 is added to a number the result is 64 more then 3 times the number. option 35 37 39 41

How do i multiply two digit numbers