Your friend's portfolio manager has suggested two high$-$yielding stocks: Consolidated Edison $($ED$)$ and Royal Bank of Scotland $($RBS$-$K$).$ ED shares cost $$40,$ yield $5\mathrm{.}5\%$ in dividends, and have a risk index of $1\mathrm{.}1$ per share. RBS$-$K shares cost $$25,$ yield $7\mathrm{.}5\%$ in dividends, and have a risk index of $1\mathrm{.}3$ per share. You have up to $$32000$ to invest and would like to earn at least $$1760$ in dividends. How many shares $($to the nearest tenth of a unit$)$ of each stock should you purchase in order to meet your requirements and minimize the total risk index for your portfolio?

Buy $???$

shares of ED and $???$

shares of RBS$-$K$.$ The minimum total risk index is c $=$

$.$