$2.$ According to financial planners, the average retiree requires approximately $70\%$ of their last year$$s working salary each year to live comfortably in retirement. Assume that you want to earn a fixed amount of interest each year in retirement. Your goal is to spend only the interest and still live comfortably; thus, you will be able to spend the same amount of money each year foreve. Assume you retire at $66$ and can earn a $6\%$ return on your retirement savings, how much must You have saved to live only off the interest?