Suppose there is a negative income tax for all incomes below $20,000. Families receive a payment of 30% of the first $20,000 of their household income, and it is not phased out no matter the income. However, for any income above the $20,000 threshold, the tax rate on the additional income (above $20,000) is 20%. The McIntire family earns $10,000 in income this year. What is their after-tax income? $7,000 $10,000 $13,000 $20,000