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 (%)	0.043	0.031	0.060
Std. Deviation (%)	0.57	0.34	0.54

Correlation matrix
	US stock	US bond	World stock
US stock	1	0.32	0.53
US bond		1	0.34
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?