In considering materiality for planning purposes, an auditor believes that misstatements aggregating $10 000 would have a material effect on an entity's income statement, but that misstatements would have to aggregate $20 000 to materially affect the statement of financial position. Ordinarily, it would be appropriate to design auditing procedures that would be expected to detect misstatements that aggregate:

1. $10 000.
2. $15 000.
3. $20 000.
4. $30 000.