b. The following figures as for AF Stationery Trading as at March 2020. (RM) Sales 180,000 50,000 Average inventory Gross profit Expenses 15,000 10,000 Non-current assets 120,000 Closing inventory 15.000 Accounts Receivable 6.000 i. Calculate average collection period. (2 marks) ii. Calculate Net profit margin (2 marks) iii. Calculate Inventory Turnover (2 marks) iv. Calculate Gross profit margin (2 marks)