please explain step by step

9. Your younger sister, Betty La Fea, will start college in five years. She has just informed your parents that she wants to go to La Vida University, which will cost $19,000 per year for four years (cost assumed to come at the end of each year). Anticipating Betty's ambitions, your parents started investing $2,500 per year five years ago and will continue to do so for five more years. How much more will your parents have to invest each year (A?) for the next five years to have the necessary funds for Linda's education? Use 10 percent as the appropriate interest rate throughout this problem (for discounting or compounding). This timeline depicts the cash flows described (in thousands of dollars.)