House cost $=$ $ $250,000.12\%$ down payment. $47$ years mortgage. Bank interest rate is $16\%($r$=16\%).$ Tell me how much your biweekly payment will be$.$ After $17$ years the market interest rate becomes $5\%($r$-5\%0).$ Because of the lower interest rate you would like to refinance your house with a lower interest rate and would like to pay back money to the bank weekly. Tell me how much your weekly payment will be