Cost of sales profit after tax 2016 2017 2018 700,000 800,000 900,000 40,000 70,000 90,000 Inventory under weighted average FIFO 200,000 250,000 300,000 250,000 290,000 350,000 retained earnings 2016 end 2,000,000 How change in inventory valuation method to FIFO in 2018 will impact financial statement in 2018