Toyota Corp's stock is $$28$ per share. Its expected return is $23\%$ and variance is $10\%.$ Honda Corp's stock is $$118$

per share. Its expected return is $19\%$ and variance is $5\%.$ Benz Corp's stock is $$42$ per share. Its expected

return is $13\%$ and variance $4\%.$ The covariance between Toyota and Honda is $0\mathrm{.}08.$ What would be the standard

deviation of a portfolio consisting of $50\%$ Toyota and $50\%$ Honda?

Place your answer in decimal form, for example, as $0\mathrm{.}14256$ and not in percent form such as $14\mathrm{.}256\%.$