Toyota Corp's stock is $$32$ per share. Its expected return is $20\%$ and variance is $14\%.$ Honda Corp's stock is $$21$ per share. Its expected return is $19\%$ and variance is $7\%.$ Benz Corp's stock is $$45$ per share. Its expected return is $14\%$ and variance $5\%.$ The covariance between Toyota and Honda is $0\mathrm{.}03.$ What would be the standard deviation of a portfolio consisting of $50\%$ Toyota and $50\%$ Honda?