Consider the following expected returns, volatilities, and correlations:

Stock	Expected Return	Standard Deviation	Correlation with Duke Energy	Correlation with Microsoft	Correlation with Wal-Mart
Duke Energy	13.1%	5.06%	1.0	-0.538	-0.170
Microsoft	43.0%	28.96%	-0.538	1.0	0.768
Wal-Mart	21.2%	18.36%	-0.170	0.768	1.0

What is the volatility of a portfolio equally invested in Duke Energy and Microsoft?

Please input your response in percent rounded to two decimal places without the percent sign.