Mileage of a petrol car is 12 kmpl. mileage of a diesel car is 18 kmpl. price of petrol per litre is Rs.77. price of diesel per litre is Rs.65. the cost difference between the petrol and diesel car is Rs.200000. the cost of maintenance of petrolcar is Rs.8000 and that of diesel car is Rs.12000.
the interest of the car per annum is 12 percent per annum. what is the cost per km if petrol car is used and diesel car is used?