These are the cap tables for DELTA, Inc. AFTER two different financing rounds (Series A & Series B).

	Before invest.	Series A			Series B
		Shares held - total after round	Percent	Value of all shared held	Shares held - total after round	Percent	Value of all shares held
Founder	90%	5,400,000	67.5%	$5,400,000	5,400,000	48%	$10,800,000
Investor A		2,000,000	25.0%	$2,000,000	2,250,000	20%	$4,500,000
Investor B		--	--	--	3,000,000	26.7%	$6,000,000
Options	10%	600,000	7.5%	$600,000	600,000	5.3%	$1,200,000
Total	100%	8,000,000	100%	$8,000,000	11,250,000	100.0%	$22,500,000

What was the pre-money valuation for the Series B?