On $1/1/24$ and Mary, who is in the $25\%$ marginal tax bracket, purchased an annuity that will pay her $$15,000$ per year for the remainder of her life. $$15,000$ would be given to her on $12/31$ of each year! Her life expectancy is $15$ years. The cost of the annuity is $$155,695,$ and the cost is calculated to yield her an expected $5\%$ return on her investment.