You have the following information about the daily returns, standard deviations, and correlations between a US stock index, a US bond index, and an All-world Ex-US stock index:

	US stock	US bond	World stock
Expected return (%)	0.045	0.036	0.06
Std. Deviation (%)	0.54	0.38	0.66

Correlation matrix
	US stock	US bond	World stock
US stock	1	0.33	0.54
US bond		1	0.37
World stock			1

What is the standard deviation of returns on a portfolio composed of 50% US stock, 30% US bond, and 20% World stock indices?

Enter answer as a percentage, accurate to two decimal places.