Hello, can someone please explain to me how to solve for a historical data! I tried to solve for the % of sales but the rest am having hard time with. Can you please explain. thank you

Historical HIStorical Historical INCOME STATEMENT 2015 2016 2017 2,928.8 2,938.6 3,229.9 Revenue (Sales) Growth (%) Cost of Goods Sold 2,277.3 2,261.5 2,510.9 % of Sales 77.8% 77.0% 77.7% Gross Profit % of Sales 393.9 390.8 441.5 Operating Expenses (SG&A) % of Sales Operating Income (EBIT) Interest Expense 64.0 59.7 60.8 16.4 0.4 0.3 Debt Extinguishment Costs Other (Expense) Income (3.2) 0.4 (4.1) Pretax Income Income Tax Expense 25.5 60.4 38.7 Tax Rate NM NM NM Loss from discontinued operations, net of income taxes 3.8 1.2 231.2 Net Income