financial mathematics

please be super explicit with the procedure

Enrique buys a car, paying a down payment of $33,300 and agrees to pay $12,290 at the end of each semester for as long as it takes. If the price of the car is $222,000 and the applicable interest rate is 5% per annum, convertible semi-annually: a. Calculate how many full payments of $12,290 will be required (i.e. calculate n ). b. If Enrique chooses to make a larger final payment at time n, calculate how much it would be (i.e. calculate the total payment at time n ). c. If Enrique prefers to make a smaller final payment one semester after the last payment of $12,290, calculate how much it would be