Determine the total allowable 2020 earned income credit in each of the following situations:
a. Judy is single and earns $6,500 in salary for the year. In addition, she receives $3,500 in unemployment compensation during the year.

b. Monica is a single parent with 1 dependent child. She earns $12,500 from her job as a taxicab driver. She also receives $4,700 in child support from her ex- spouse.

c. Paul and Yvonne are married and have 3 dependent children. Their earned income is $21,300, and they receive $3,900 in interest income from their savings account.

d. Hattie is married to Herbert, and they have 2 dependent children. During February, Herbert leaves and hasn't been seen or heard from since. Hattie earns $16,400 from her job. During January and February, Herbert earned $4,800, but Hattie has no idea how much he earned for the entire year.