Ahmad is saving up for his son's college fund. He starts by investing $3,500 into an account paying 3.95% interest compounded monthly. (a) If he contributes $50 a month, how much money will he be able to contribute towards his son's college in 18 years? $ (b) In 18 years, how much money will Ahmad have personally contributed towards his son's college? 4 (c) In 18 years, how much money will Ahmad have earned in interest? $