if I could just get a quick explanation because I don't understand how to do this at all

please and thank you

Selected comparative financial statements of Korbin Company follow. KORBIN COMPANY Comparative Income Statements For Years Ended December 31, 2019, 2018, and 2017 2019 2018 2017 Sales $ 400,277 $ 306,645 $ 212,800 Cost of goods sold 240,967 191,960 136,192 Gross profit 159,310 114,685 76,608 Selling expenses 56,839 42,317 28,090 Administrative expenses 36,025 26,985 17,662 Total expenses 92,864 69,302 45,752 Income before taxes 66,446 45,383 30,856 Income tax expense 12,359 9,304 6,264 Net income $ 54,087 $ 36,079 $ 24,592 2018 2017 KORBIN COMPANY Comparative Balance Sheets December 31, 2019, 2018, and 2017 2019 Assets Current assets $ 61,095 Long-term investments Plant assets, net 113,461 Total assets $ 174,556 Liabilities and Equity Current liabilities $ 25,485 Common stock 71,000 Other paid in capital 8,875 Retained earnings 69,196 Total liabilities and equity $ 174,556 $ 40,891 900 103,212 $ 145,003 $ 54,661 3,660 61,814 $ 120,135 $ 21,605 71,000 8,875 43,523 $ 145,003 $ 21,024 53,000 5,889 40,222 $ 120,135 2. Complete the below table to calculate income statement data in common-size percents. (Round your percentage answers to 2 decimal places.) 2017 100.00% KORBIN COMPANY Common-Size Comparative Income Statements For Years Ended December 31, 2019, 2018, and 2017 2019 2018 Sales 100.00% 100.00% Cost of goods sold Gross profit Selling expenses Administrative expenses Total expenses Income before taxes Income tax expense Net income % % % 3. Complete the below table to calculate the balance sheet data in trend percents with 2017 as base year. (Round your percentage answers to 2 decimal places.) KORBIN COMPANY Balance Sheet Data in Trend Percents December 31, 2019, 2018 and 2017 2019 2018 2017 Assets Current assets % % 100.00 % Long-term investments 0.00 100.00 100.00 100.00 % % % Plant assets, net Total assets Liabilities and Equity Current liabilities % 100.00 % Common stock 100.00 100.00 Other paid-in capital Retained earnings Total liabilities and equity 100.00 100.00%