(2000-((420600-400000)*5%))*2 is 1940 but 1940 is not a correct answer. is there any other way to solve this?

EXHIBIT 8-8 Child Tax Credit Phase-Out Threshold Exhibit 8-8. Trey has two dependents, his daughters, ages 14 and 18 , at year-end. Trey files a joint return with his spouse. What amount of child tax credit (either as a child or a qualifying dependent) will Trey be able to claim in 2022 for his daughters under each of the following alternative situations? Use Exhibit 8-8, Required: c. His AGI is $420,600, and his daughters are ages 10 and 12 . Complete this question by entering your answers in the tabs below. His AGI is $420,600, and his daughters are ages 10 and 12