I want to calculate the Debt Ratio of this problem, using the total debt / own capital method. I know that option A own capital is 63,000 euros and option B is 18,000 euros. In the following table, where do I take the total debt figure from?

Option a (70% own financing, 30% other financing) 90,000.00 euros Option b (20% own financing, 80% other financing) 90,000.00 euros Machine cost 70%. 63,000.00 euros 20%. 18,000.00 euros Own Financing Other Financing 30%. 27,000.00 euros 80%. 72,000.00 euros (b) Cost of finance 1,755.00 euros 3,960.00 euros (a) Returns @ 20% 18,000.00 euros 18,000.00 euros 16,245.00 euros 14,040.00 euros (a-b) Profit after cost of financing Income Tax 25% 4,061.25 euros 3,510.00 euros Returns after tax 12,183.75 euros 10,530.00 euros ROI 19.34% 58.50%