Man has $100 and wants to buy a radio and earphones. all radios and earphones are 25% off the list price and no sales tax. can he buy a radio and earphones that list for $130 and have money left?

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.

I’m stuck on this equation, anyone got the answer?

15 oranges weigh 3.75 kilograms (kg). if each orange weighs approximately the same, approximately how much does each orange weigh?