A company has 500 million shares outstanding and its stock trades at $40 per share. The book value of Shareholders' Equity is $7.5 billion. There is $5 billion of debt outstanding and cash equals $1 billion. The company pays an annual dividend of $0.50 per share, for a dividend yield of 1.25%. If current year EBITDA is expected to be $3 billion, what is the firm's EV/EBITDA multiple, rounded to the nearest tenth?