The returns of Stock A and Stock $B$ have correlation $=0\mathrm{.}5.$ The variance of Stock $A$ is $0\mathrm{.}20$ and the variance of Stock B is $0\mathrm{.}15.$ What is the variance of a portfolio that invests $$5,000$ in Stock A and $$20,000$ in Stock B$?$

Correct Answer $0\mathrm{.}132$