During the year ended 31 March 20X6, Lisbon experienced the following transactions or events: (i) Lisbon sold an asset to a finance company and leased it back for the remainder of its useful life. The accountant has decided that this should be treated as a secured loan. (ii) The company's statement of profit or loss prepared using historical costs showed a loss from operating its shops, but Lisbon is aware that the increase in the value of its properties during the period far outweigh the operating loss. (iii) Inventory has up to this year been valued using FIFO but the accountant is considering changing to the weighted average method for the year to 31 March 20X6. The accountant is aware that some members of the board of Lisbon have little understanding of accounting and he is worried about his presentation of the financial statements at the board meeting. How should he deal with this situation?