John has borrowed $50,000 on which he is paying interest at 17.5% effective per year. He is contributing a level amount m to a sinking fund at the end of each year. The sinking fund earns an annual effective rate of 9%. His combined payment to both the fund and the loan is $9,116.82 annually. Determine the year in which the balance of the sinking fund will be sufficient to repay the loan.