x Your answer is incorrect. Donald and Helen Martin have two children, Betty and Karen, who are ages 7 and 10, respectively, in the current year. Betty and Karen are qualified dependents of the Martins. They also have a niece, Nancy (age 11 ), who lives with them and qualifies as a dependent. AGI is $440,300. Included in the AGI of $440,300 is salary for Donald of $380,000 and for Helen of $12,500. Compute the Martins' child tax credit. Child tax credit $