The progressive tax rates in an economy are 0% for the first $10,000 of income, 10% for income between $10,000 and $50,000, 20% for income between $50,000 and $150,000, and 30% for income above $150,000. What is the average tax rate for someone who has an income of $200,000?
a. 30%
b. 17.5%
c. 19.5%
d. 22.5%