I apologize for the small picture. I have tried this question and the professor has asked us to do this question by using a chart and using values around the answer in the back of the book (which is i = 2.208%) and I thought I knew how to do it but I'm getting huge values in my chart here is my attempt:

2.2.11 A loan of 1000 is repaid with 12 annual payments of 100 each starting one year after the loan is made. The effective annual in- terest rate is 3.5% for the first 4 years. Find the effective annual interest rate i for the final 8 years