A car is purchased for a downpayment of $3,000 with an additional monthly payment of $400 for 36 months. The
formula for the amount spent on the car is S = 3000 + 400 M, where S is the current amount of money that has been
spent and M is the number of months of payments that have been made.
i) How much money will have been spent after a year?
ii) What will be the final cost of the car?