: Your 15-year old son is the father of twins! Congratulations! Hes asking mom and dad to start saving up for their college funds (her parents are nice, but theyve got 8 other kids). Assuming the CFS successfully freezes tuition and no other fees come up, tuition and books for both twins in the college of Arts and Science for four years will be around $50,000. Assuming you put away $100 a month, compounded annually, for the next 18 years, what interest rate will you need to save that much money?Please do not use excel