_{Mark deposits $10,000 per year at the end of each of the next 35 years into an account that pays 12.50% compounded annually. How much can he withdraw at the end of each of the 20 years following his last deposit if all withdrawals are the same dollar amount? (The thirty-fifth and last deposit is made at the beginning of the 20-year period, while the first withdrawal is made at the end of the first year in the 20-year period.)}