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 $$915$ 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

CNA Financial Corp.

What is the minimum total risk index?