Calculate the child credit for the following taxpayers. Please show your work.
a. Jeremy is a single (head of household) father with a dependent 8-year-old son and $79,600 of AGI:

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b. Jerry and Ann have two dependent preschool children and $100,000 of AGI:

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c. James and Apple have two dependent children (ages 7 and 10) and $120,400 of AGI:

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