Below are summary cash flow statements for three roughly equal-sized companies.

	($ millions)
	A		B		C
Net cash flows from operating activities	(311	)	(311	)	322
Net cash used in investing activities	(911	)	(41	)	(101	)
Net cash from financing activities	1,310		232		(251	)
Cash balance at beginning of year	161		161		161

a. Calculate each companys cash balance at the end of the year. (Enter your answers in millions.)