To buy a car, you are given two options. Option 1 is to pay $20,000 cash today. Option 2 is to make monthly payments of $500 for as long as necessary, first payment made today. If the car dealer charges interest at i (12) = 5.4%, how many full payments of $500 are needed and what would be the size of the drop payment needed 1 month after the last regular payment of $500?