Bobby Supplies Ltd uses a system of perpetual inventory. Regarding the movement of one of its stock lines, it has provided the following information: Month January February March April May June July Receipt Opening 200 @ 8.50 150 @ $9.00 200 @ $9.15 Issues 300 150 250 Balance 200 @ $8.00 Required: (a) Calculate the closing stock value at the end of June under each of the stock valuation methods of FIFO, LIFO and AVCO. Work to 2 decimal places. (24 marks) (b) Identify one advantage and one disadvantage for each of the valuation methods: FIFO, LIFO and AVCO. (6 marks) (Total 30 marks)