Sandra's sister's car can travel 12.5 more miles on a gallon of gas than sandra's truck can. if sandra's truck will use one gallon to drive 25 miles, what is the rate of change that represents jenny's mileage rate? remember to think of rate as gallons used per mile.

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.