a) Sand & Build Traders retails building materials to the public and companies. On the 20 October 2021, the business has 24 tonnes of sand in stock at a cost of R42.95 per tonne During the next two weeks, the business purchased the following amounts of sand October 23 29 30 Tonnes 57 39 26 Cost per tonne R44.95 R47 50 R49.75 On the 31 October 2021 the business sold 117 tonnes of sand to a local builder Required Calculate the cost of goods sold and the closing stock figures from the above information using the following stock methods: i) First in, first out II) Last in, first out III) Weighted average cost b) Suppose the 117 tonnes of sand were sold at R82.45 per tonne including transport Calculate the gross profit for the period under each of the three methods and show the closing stock