please solve this in one hour

Question 24 (8 points) The Bautistas Sign a mortgage for $50,000 to be amortized over 20 years with a term of 5 years at 11% cm. with equal monthly payments. On the date of the 19th payment, they make an additional payment of $25,000 subject to a penalty clause requiring a penalty of three times one month '5 interest on the prepaid principal. Find the balance at the end of the 5 year term