The directors of a company are unsure whether to amend the financial statements to include an additional $150,000 of doubtful debts. According to the guidelines in AASB 1031, this amount would be considered material if it represents 20% of total receivables. Materiality under the standard is presumed if an amount is 10% or more of the appropriate base. In this case, receivables are the appropriate base for measuring doubtful debts.