Determine the level of materiality to be used for the audit of the BHP Group Ltd's (asx code: BHP) accounts for the year ending in 2022 (BHP 2022 Annual Report) . Your answer should include a discussion of the nature of materiality, and a description of what materiality represents in terms of the audit of a set of financial statements and should discuss the different bases and considerations employed in arriving at materiality. Explain the rationale behind your choice of a certain level of materiality. You must also provide a quantitative estimate of materiality for your company.