No idea how to calculate recovery rebate credit, please help.

(+/-2900 is not a correct answer)

David and Lilly Fernandez have determined their tax liability on their joint tax return to be $2,100. They have made prepayments of $1,900, they receive a child tax credit of $500, and a recovery rebate credit of $2,900 (they did not receive this in advance). What is the amount of their tax refund or taxes due? What is the amount of their tax refund or taxes due? X Answer is not complete. (1) Description Total tax Child tax credit Prepayments Recovery rebate credit Tax refund Amount $ 2,100 2,000 1900 (2) (3) (3) $ 4,700