Materility

Dear Mike below is an excerpt from a past question. My question, how do they arrive at 17.7m.? Thanks in advance Materiality Preliminary materiality will be in the region of $17.7 million. This is the mid-point based on the assessment of revenue, total assets and profit before tax (see below). If this figure represents a significant change to the initial assessment, testing levels may also need to be modified. ½%–1% revenue = $12.9m–25.85m 1%–2% total assets = $16.4m–32.8m 5%–10% PBT = $6.2m–12.4m