I need help answering the following. I already answered 1-4 and 6. Need help answering 5, 7, and 8. Can you include the formulas for each?

LOWE'S COMPANIES, INC. Selected Financial Information (amounts in millions except per share data) \begin{tabular}{|lrr|} & February 2, & February 3, \\ & 2018 & \multicolumn{1}{c}{2017} \\ Total current assets & $12,772 & $12,000 \\ Merchandise inventory & 11,393 & 10,458 \\ Property and equipment, net of depreciation & 19,721 & 19,949 \\ Total assets & 35,291 & 34,408 \\ Total current liabilities & 12,096 & 11,974 \\ Total long-term liabilities & 17,322 & 16,000 \\ Total liabilities & 29,418 & 27,974 \\ Total stockholders' equity & 5,873 & 6,434 \\ Revenues & 68,619 & 65,017 \\ Cost of goods sold & 45,210 & 42,553 \\ Gross profit & 23,409 & 22,464 \\ Operating income & 6,586 & 5,846 \\ Earnings from continuing operations before income taxes & 5,489 & 5,201 \\ Income tax expense & 2,042 & 2,108 \\ Net earnings & 3,447 & 3,093 \\ Basic earnings per share & $4.09 & $3,48 \\ \hline \end{tabular} a. Compute the following ratios for the companies' 2017 fiscal years (years ending in January and February of 2018): (1) Current ratio. (2) Average days to sell inventory. (Use average inventory.) (3) Debt-to-assets ratio, (4) Return on investment. (Use average assets and use "earnings from continuing operations" rather than "net carnings.") (5) Gross margin percentage. (6) Asset turnover. (Use average assets.) (7) Return on sales, (Use "earnings from continuing operations" rather than "net earnings.") (8) Plant assets to long-term debt ratio. The following information relates to Home Depot, Inc., and Lowe's Companies, Inc. for their 2017 and 2016 fiscal years