Exhibit B

Ratio of Earnings to Combined Fixed Charges and Preferred Dividends

	Year ended December 31,															Period ended June 30,
	2005			2006			2007			2008			2009			2009			2010
									(US$ million)
									(unaudited)
Income before discontinued operations, income taxes and equity results		5,420			7,829			15,233			13,217			7,123			3,886			5,524
Fixed charges:
Interest costs — capitalized		86			126			78			230			266			115			102
Interest costs — expensed		560			1,222			2,517			1,765			1,558			580			979
Guaranteed preferred stock dividend		129			213			370			475			638			569			702
		775			1,561			2,965			2,470			2,462			1,264			1,783
Amortization of capitalized interest		8			13			18			26			38			11			20
Distributed income of equity investees		489			516			394			513			386			143			249
		6,692			9,919			18,610			16,226			10,009			5,304			7,576
Less: interest capitalized		(86	)		(126	)		(78	)		(230	)		(266	)		(115	)		(102	)
		6,606			9,793			18,532			15,996			9,743			5,189			7,474
Ratio of earnings to combined fixed charges and preferred dividends		8.52			6.27			6.25			6.48			3.96			4.11			4.19

B-1