How do I figure out each formula in the yellow? Please explain.

Recent financial statements for Zimmer Inc. are as follows: Zimmer Company Comparative Balance Sheet This Year 4 6 8 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 Assets Current assets: Cash Marketable securities Accounts receivable, net Inventory Other current assets Total current assets plant and equipment, net Other assets Total assets Liabilities and Stockholders' Equity Current Liabilities: Accounts payable Short-term bank loans Accrued payables Other current liabilities Total current liabilities Bonds ble, Total liabilities Stockholders' equity: Common stock Retained earnings Total stockholders' equity Total liabilities and stockholders' equity Required: Compute the following ratios for the current year only: Gross margin percentage 360,000 220,000 775,000 925,000 355 000 1,975,000 75 000 250,000 750,000 550,000 275 ooo 575 ooo 2 400 ooo 1,150,000 1 135 ooo 2 285 s s Last Year 310,000 80, 000 000 750, 000 195 225,000 600, 000 395,000 223 400 1,443,400 400 000 1,843.400 941 600 2 091 600 Zimmer Company Income Statement Sales (all on account) Cost Of goods sold Gross margin Selling and administrative expenses Operating expenses Depreciation and amortization General and administrative expenses Total selling and administrative expenses Net operating income Interest expense Net income before taxes Income taxes Net income Additional information: Dividend per share paid in current year Market ce of shares at rend par value of common stock per share Number of share outstanding This Year 2 988000 1 992 000 985,500 410,500 150 ooo 1 546 000 446,000 60 ooo 386,000 135 100 1.00 42.00 20.00 Current ratio (rounded to two decimal places) Acid-test ratio (rounded to two decimal places) Accounts receivable turnover (rounded to two decimal places) Average collection period (rounded to the nearest whole day) Inventory turnover ratio (rounded to two decimal places) Average sales period (rounded to the nearest whole day) Debt-to-equity ratio (rounded to two decimal places) Times interest earned (rounded to two decimal places) Book value per share (rounded to two decimal places) Earnings per share (rounded to two decimal places) Dividend payout ratio (rounded to three decimal places) Dividend yield ratio (rounded to three decimal places) Price-earnings ratio (rounded to two decimal places)