Using the data in the following table, and the fact that the correlation of A and B is 0.20, calculate the volatility (standard deviation) of a portfolio that is 70% invested in stock A and 30% invested in stock B.

	Realized Returns
Year	Stock A		Stock B
2008	4%		28%
2009	8%		23%
2010	5%		4%
2011	5%		1%
2012	4%		15%
2013	11%		25%

The standard deviation of the portfolio is ___%. (round to two decimal places)