Your client has $$100,000$ invested in stock A$.$ She would like to build a two$-$stock portfolio by investing another $$100,000$ in either stock B or $C.$ She wants a portfolio with an expected return of at

least $15\mathrm{.}0\%$ and as low a risk as possible, but the standard deviation must be no more than $40\%.$ What do you advise her to do$,$ and what will be the portfolio expected return and standard deviation?

The expected return of the portfolio with stock B is $,\%.($Round to one decimal place.$)$