Required information [The following information applies to the questions displayed below.) In 2019, Zach is single with no dependents. He is not claimed as a dependent on another's return. All of his income is from salary and he does not have any for AGI deductions. What is his earned income credit in the following alternative scenarios? Use Exhibit 8-10. (Do not round intermediate calculations. Round your final answer to the nearest whole dollar amount. Leave no answer blank. Enter zero if applicable.) a. Zach is 29 years old and his AGI is $4,300. Earned income credit c. Zach is 29 years old and his AGI is $16,800. Earned income credit d. Zach is 24 years old and his AGI is $4,300. Earned income credit