gordon barbara wishes to purchase a mansion in gotham city. to do so, she will have to borrow 12 million dollars. the market interest rate is 0.50% per month. a) suppose gordon takes a 30-year loan with equal monthly payments. what will be the amount of the monthly payments? b) suppose instead, gordon takes a 90-year loan with equal monthly payments. what will be the amount of the monthly payments? c) now suppose that gordon takes a 90-year loan with equal monthly payments, as in (b). further, suppose that 30 years from now, market interest rates drop to 0.25% per month. gordon decides to refinance and takes out a 60-year loan. what will be the amount of the new payments?