Reviewing the financial statements of KRJ Enterprises $($all figures in $ millions$),$ you find the following items: total debt of $$536,$ total liabilities of $$722,$ total cash and marketable securities of $$82,$ operating earnings of $$175,$ and depreciation and amortization expenses of $$83.$ Calculate the debt to EBITDA ratio. Present your answer rounded to two decimal places $($e$.$g$.,2\mathrm{.}34).$