A group of friends is planning to drive across the country. They will need two cars and will need to determine the cost of mileage for the trip. Part A The first car's gas tank holds 15.4 gallons of gas and usually costs $37.73 to fill. During the drive, the average price per gallon is expected to be 7% higher than the usual cost. Write an equation that can be used to calculate the total cost, t, of purchasing g gallons of gas at the higher rate.