I solved up to current ratios but I dont know how to get net debt as a percentage

Zeus Corporation Mars Company Statement of income data: Net sales $3,350 $6,810 Cost of goods sold 2,980 5,740 Selling and administrative expenses 95 410 Interest expense 130 175 Other expenses 8 0 Income taxes Net income $ 75 $ 375 Statement of cash flows data: Net cash inflow from operating activities $ 125 $ 260 Net increase in cash during the year 10 37 Statement of financial position data: End-ofyear balances: Current assets $1,020 $1,620 Property, plant, and equipment (net) 1,865 2,940 Other assets 720 1,020 Total assets $3,605 $5,580 Current liabilities $ 575 $ 830 Long-term debt 2,220 3,130 Total sha reholders' equity 810 1,620 Total liabilities and shareholders' equity $3,605 $5,580 Beginning-of-year balances: Total assets $3,250 $5,160 Total shareholders' equity 750 1,245 Other data: Average net receivables S 350 S 790 Average inventory 290 575 Required a. For each company, calculate the following ratios: i. Average collection period for receivables ii. Days to sell inventory iii. Current ratio iv. Net debt as a percentage of total capitalization v. Interest coverage vi. Return on assets vii. Return on equity