if posible give me excel answer too

Consider the following fixed-rate, level-payment mortgage: Maturity =180 months Property value =$250,000 with a 25% down payment. Annual mortgage rate =8% What is the mortgage balance at the beginning of month 135 assuming no prepayment? Hint: The monthly mortgage payment is the same in each month. You can use the mortgage payment to estimate the beginning balance of the mortgage in a specific month