Stock A has an avg. returns of $18\%.$ Stock B has a return of $14\%.$ A has a variance of $0\mathrm{.}25,$ and Bs variance is $0\mathrm{.}1225.$ The correlation of A and B is $-0\mathrm{.}75.$ If you desire $16\%$ returns from A and B$,$ how much do you invest in A$,$ and how much do you invest in B$?$ what is your portfolios standard deviation?