Mrs. Martha Sabogal, buys a home appliance for a value of $6.000.000 million

if she makes a down payment of 40% and pays the balance in quarterly installments of $500,000.00 as long as necessary; assuming interest at 18% NCMV, find the number of payments of $500,000 and the final payment that is made three months after the last payment of $500,000 with which she will pay off the debt.