A. Calculate the total child tax credit and other dependent credit for the following taxpayers. Please show work.

1) Ninfa is a single mother with 8-year-old and 9-year-old dependent sons and has $50,000 of AGI.

2) Sharon and Mark have one dependent 2-year-old child and $426,300 of AGI.

3) Carol is single and has one dependent 18-year-old son and $21,000 of AGI.

B. Clark maintains a household for himself and his two dependent preschool children and files as head of household. For the year ended December 31, 2018, Clark earned a salary of $62,000. He paid $3,600 to a housekeeper to care for his children in his home, and also paid $1,500 to a kiddie play camp for child care. He had no other income or expenses during 2018. His tax liability before any credits is $5,011. How much can Clark claim as a child and dependent care credit, child tax credit, and additional child tax credit in 2018? Please show work.