Wing Sze has a mortgage for $400,155.00. The term of the mortgage is 5 years, and the amortization period is 15 years. Wing Sze will make monthly payments and the mortgage rate is r(12) = 8.250%. The bank offers Wing Sze a flexible repayment plan, so once a year she can miss a payment or make a payment twice as large as usual. Each year, Wing Sze doubles the first payment of the year. a) How much would Wing Sze owe at the end of the mortgage term if they didn't double any payments? $ b) How much does Wing Sze still owe at the end of the mortgage term (including the extra/missed payments)? $