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[The following information applies to the questions displayed below.] In 2021, Zach is single with no dependents. He is not claimed as a dependent on anothers 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 8-11. (Round your intermediate and final answers to the nearest whole dollar amount. 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 $5,600.

b. Zach is 29 years old and his AGI is $9,750.

c. Zach is 29 years old and his AGI is $18,000

d. Zach is 17 years old and his AGI is $5,600

EXHIBIT 8-11 2021 Earned Income Credit Table (1) Maximum Earned Income Eligible for Credit Qualifying Children (4) (3) Credit Phase-Out for Maximum AGI (or earned income (2) Credit if greater) Over This Credit % (1) (2) Amount Married taxpayers filing joint returns 15.3% $1,502 $14,820 No Credit When AGI (or earned income if greater) Equals or Exceeds This Amount (4) + [(3)/(5)] (5) Phase-Out Percentage 0 $ 9,820 15.3% $24,637 1 10,640 34 3,618 25,470 15.98 48,108 2 14,950 40 5,980 25,470 21.06 53.865 3+ 14,950 45 6,728 25,470 21.06 57,414 All taxpayers except married taxpayers filing joint returns 15.3% $ 1,502 $ 11,610 15.3% 0 $ 9,820 $21,427 1 10,640 34 3,618 19,520 15.98 42,158 2 14,950 40 19,520 21.06 5,980 6,728 47,915 51,464 3+ 14,950 45 19,520 21.06