Fred and Wilma want to save money to provide for their retirement and for the education of their daughter Pebbles. Pebbles will need $25,000 annually for four years beginning 15 years from now. Fred and Wilma figure that they will both retire 30 years from now and would like to have $100,000 annually for 25 years (with the first withdrawal beginning one year after their retirement). Given an interest rate of 9%, how much must Fred and Wilma invest annually if they plan to begin making deposits in one year and will make 30 deposits in all?

I have the solution ($9,565) but am struggling with the steps