4. Mr. Smith buys a cottage with a downpayment of $50,000 and a 15-year mortgage for the remaining $200,000 at j2 = 4%. There is a penalty of three times monthly interest on the outstanding balance for paying off the loan early. After 2 years, another company offers him a chance to refinance at j2 = 3.4% for the remaining 13 years of the loan. Should he refinance