A couplebuy a house listed at $180,000 with a $30,000 down payment and amortized the rest of the debt with a quarterly payments made at the end of the quarter for 20 years. If the interest rate is 10%compounded quarterly
A. Find the size of the quarterly payment
B. How many payment of been made after 12 years. ie what is the value of k
C. Find the unpaid balance of the debt after 12 years.