Investments: Financial Stocks At the end of September $2021,$ Toronto Dominion Bank $($TD$)$ stock cost $$66$ per share, was expected to yield $4\%$ per year in dividends $($calculated on the total value of TD stock you bought$),$ and had a risk index of $3\mathrm{.}0$ per share, while CNA Financial Corp. $($CNA$)$ stock cost $$42$ per share, was expected to yield $3\mathrm{.}5\%$ per year in dividends, and had a risk index of $2\mathrm{.}0$ per share.$$ You have up to $$25,800$ to invest in these stocks, and would like to earn at least $$939$ in dividends over the course of a year. $($Assume the dividends to be unchanged for the year.$)$ How many shares $($to the nearest tenth of a unit$)$ of each stock should you purchase to meet your requirements and minimize the total risk index for your portfolio?

Toronto Dominion Bank$\_\_\_\_$ shares CNA Financial Corp. $0$ shares

What is the minimum total risk index? $($Round your answer to two decimal places.$)$