Determine the amount of the child tax credit in each of the following cases: a. A single parent with modified AGI of $215,000 and one child age 4. b. A single parent with modified AGI of $79,600 and three children ages 7, 9, and 12. c. A married couple, filing jointly, with modified AGI of $409,533 and two children age 14 and 16. d. A married couple, filing jointly, with modified AGI of $133,655 and one child, age 13. Child Tax Credit Allowed