please do by hand :)

Alex is financing a new luxury truck. He will make 144 level end of month paymebts with nominal interest rate 8.4% convertible monthly. He makes a down payment of 5,000,000.00 and the amount of principal paid in the 72nd payment is 735,564.4293 a) what is the price of the luxury truck and b) Alex misses his scheduled payments 37-48 and on scheduled payment 49 he resumes making payments at the original set amount. He still pays off the loan after 144 months by making a larger final payment. What is the amount of the final payment