Suppose a tax rate of 10 percent applies to all income up to $20,000 a year, income above $20,000 up to $50,000 a year is taxed at a rate of 15%, and income above $50,000 a year is taxed at 20%. Calculate the absolute amount of tax paid by a person whose annual income is $30,000

a. $2,000
b. $2,500
c. $4,500
d. $4,000
e. $3,500

e