how I calculate inventory

R Revenue 1 000 000 Gross profit ? Other income 50 000 Other expenses 435 000 Net profit ? Extract from statement of financial position for the year ended 30 April 2021: R ASSETS 200 000 Non-current assets 120 000 Current assets 80 000 EQUITY AND LIABILITIES 200 000 Capital and reserves 100 000 Non-current liabilities ? Current liabilities 50 000 Calculated financial ratios for the year ended 30 April 2021: Quick ratio 1 Gross profit margin 40% Return on equity (ROE) 15% Creditors payment period 33,33 days Debt-equity ratio 1 Purchases for the year amounted to R547 500