A father is planning for his son (currently five years old) to attend college in 13 years. The father expects that his son's tuition will be $35,000 per year for four years. The father can only save $2,900 per year (beginning today) for 13 years in a savings account that earns 10% annually. A financial advisor warns the father that these deposits will not be enough to fully fund his son's expected tuition expense. Assuming the son will make 4 equal withdrawals from the college fund beginning at age 18, how much in additional college funds will the son need to come up with each year?