the simple interest on a sum of money is 25% of the principal and the number of years is equal to the rate percent per annum. find the rate ​

Tony is charged $ 50 and additional $0.15 per miles for renting a car. a) represent the cost of renting a car with an equation,and the determine the cost if he drove it70 miles.b) what would be the cost of a car rental if the car was driven 250 miles? show work