Suppose a nation has a tax rate of 9% on the first $15,000 of taxable income, then 15% on the next $25,000, then 25% on the next $30,000, and 35% on all taxable income above $70,000. There is a $2,000 exemption per family member.

Anands family has 4 members and earns $80,000 per year. What is his familys average tax rate? (keep 2 decimal places)