Mike, therese, tristan, and elena want to improve their fico credit score. mike uses 10% of his credit limit, therese uses 30% of her limit, tristan uses 50% of his limit, and elena uses 75% of her limit. who is improving their score the most?

The answer is Mike.
Mike is improving the score most as he uses 10% of the credit limit.
The one who uses less percent of his credit limit will improve his/her score and the one who uses greater percent of his credit limit will less improve his scores.