Full Mark Limited trades in embroideries on credit basis. Its financial information for years 2018 and 2019 is summarized below:

Full Mark Limited Balance Sheets as at 31 Dec 2018 31 Dec 2019 $'000 $'000 Assets Cash Accounts receivable Inventories Prepayments Investments (long-term) Buildings Equipment Total assets 8,745 62,000 58,500 10,000 119,400 402,000 56,061 $716,706 18,020 68,000 51,990 11,000 71,100 334,500 48,090 $602,700 Liabilities and Equity Accounts payable Salaries payable Long-term bank loan Owner's equity Total liabilities and shareholders' equity 64,800 38,400 144,000 469,506 $716,706 73,365 24,300 99,435 405,600 $602,700 Full Mark Limited Income Statements for the years ended 31 December 2019 $'000 2018 $'000 Revenues: Net sales Rent revenue 648,000 54,000 702,000 601,263 0 601,263 Less: Cost and Expenses Cost of goods sold Administrative expenses Selling expenses 387,447 135,000 22,500 360,975 105,611 14,700 Interest expense Tax expense 18,000 15,147 578,094 $123,906 13,500 3,601 498,387 $102,876 Net profit Ratios for 2018 are as follows: (1) Profit margin (2) Return on total assets (3) Gross profit as a percentage of sales (4) Current ratio (5) Quick ratio (6) Working capital (7) Debt ratio (8) Times interest earned (9) Accounts receivable turnover (10) Days' sales in inventory 17.11% 19.40% 39.96% 1.53:1 0.88:1 $51,345,000 32.70% 8.89 times 10.37 times 47.90 days Required: (a) Calculate the ratios listed below for Full Mark Limited for 2019 (show your workings and calculate to two decimal places): (1) Profit margin (2) Return on total assets (3) Gross profit as a percentage of sales (4) Current ratio (5) Quick ratio (6) Working capital (7) Debt ratio (8) Times interest earned (9) Accounts receivable turnover (10) Days' sales in inventory (b) Comment on Full Mark Limited's profitability, efficiency in use of assets and liquidity performance for 2019 as compared with those of 2018. (20 marks) (6 marks)