QUESTION THREE [20] The following information was obtained from the accounting records of Nick Traders for year ended 31 December 2019: 2018 2019 R R 4 250 000 210 000 200 000 125 000 30 000 5 000 Sales Purchases Opening stock Purchase returns Carriage on sales Import duty Carriage on purchases 5 000 3 500 4 000 10 000 5 000 9 000 2 500 1 500 Closing stock for the 2019 year was R15 000 Required: 3.1. Differentiate using examples the different types of inventory systems. 3.2. Calculate the gross profit percentages for both the 2018 and 2019 years. (16)