John Gill Commentary Esther 4:7

"And Mordecai told him of all that had happened unto him, and the exact sum of the money that Haman had promised to pay to the king`s treasuries for the Jews, to destroy them." — Esther 4:7 (ASV)

And Mordecai told him of all that had happened to him
How, for refusing to reverence Haman, he was incensed against him, and against all the Jews for his sake; and had vowed revenge on them, and had formed a scheme for the ruin of them:

and of the sum of money that Haman had promised to pay to the king's
treasuries for the Jews, to destroy them
the 10,000 talents of silver he proposed to pay into the king's exchequer in lieu of the Jews' tribute; which Mordecai observes, to show how bent he was upon the destruction of the Jews, and cared not what it cost him to gain his point; and perhaps Mordecai as yet might not know that the king had remitted it.