Please help solve the following.

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Revenues 2 3 4 LOGS 500 515 536 Gross Profit 300 306 314 SG &A 200 209 222 100 102 104 Operating Income 100 107 118 Depreciation 30 30 30 EBITDA 130 137 148 Debt 300 300 Notes : ( 1 ) revenue growth in years 2 and 3 is all volume driven ( 2 ) COGS in year 1 is 67% variable 1 . In the above example ( which is the same historical information as the previous problem ) assume the biggest risk to this company is customer concentration . Assume one customer accounts for 25% of sales . Assume the company loses this customer . Project revenue , COGS and EBITDA in year 4 . Calculate Debt / EBITDA and interest coverage in year 4 . 2 . Now assume the largest risk to this customer is rising costs that cannot be passed along to the customers . Specifically , assume that the variable component of COGS rises in price by 30% in year 4 . Project revenue , COGS and EBITDA in year 4 . Calculate Debt / EBITDA and interest coverage in year 4 .Calculating Interest Coverage and Fixed When calculating interest expense : 1 . Use 6% multiplied by debt outstanding when : A. It is an Investment Grade company and / or B. Debt / EBITDA is less than 3x 2. Use 10 % multiplied by debt outstanding when : A . It is a High Yield company and / or B. Debt / EBITDA is greater than 3x