A good friend of yours just inherited $350,000 which was invested at 4.0% by their great uncle. They now feel that they can retire if the numbers work out okay. They need to withdraw $35,000 at the beginning of each year, beginning immediately. They also want to have $15,000 left when they cease to withdraw funds from the account. For how many years can they make the $35,000 withdrawal and still have $15,000 left in the end?