Willis Publishing has $30 billion in total assets. The company's basic earning power (BEP) ratio is 20 percent, and its times-interest-earned ratio is 8.0. Willis' depreciation and amortization expense totals $3.2 billion. It has $2 billion in lease payments and $1 billion must go toward principal payments on outstanding loans and long-term debt. What is Willis' EBITDA coverage ratio?