10. Education Tax Credit. (Obj. 2) Curt and Kathy Norton paid \$3,200 of tuition for their son, who attends college less than half-time. Of this amount, $1,500 was paid on December 28, 2020, for the Spring 2021 semester, and \$1,700 was paid on August 4, 2021, for the Fall 2021 semester. a. Compute the Nortons' 2021 education tax credit if their AGI is $71,900. How much of their credit is refundable versus nonrefundable? b. Same as in Part a., except that the Nortons' AGI is $122,816