Suppose the tax rate on the first $10,000 of income is 0 percent; 10 percent on the next $20,000; 20 percent on the next $20,000; 30 percent on the next $20,000; and 40 percent on income over $70,000. Family A has an income of $100,000 and Family B an income of $65,000. What is the tax bill of each family and the average tax rate for each family?