Anwar and Alyce sign a mortgage for $250,000 amortized over 25 years, monthly payments, 3 year term at 8% c.m.. On the date of the 15^th payment an additional payment of $50,000 was made subject to the following penalty clause, "Any prepaid principal shall be subject to a penalty equal to three times one month's interest on the prepaid principal." Find the balance owing at the end of the term.