a problem is listed below. identify its type. john bought a new house. he made a $3,500 down payment and financed the rest, $300,000, through his credit union. the credit union charged him 12% per year compounded monthly for 27 years. how much were his monthly payments? a) future value with compound interest b) present value c) sinking fund d) amortization e) present value of an annuity f) none of the above.