suru verb (special), intransitive verb
Intransitive use: the subject gains an advantage or profit. Often used in formal or written contexts.
この取引で会社は大いに利した。
The company profited greatly from this deal.
suru verb (special), transitive verb
benefit (someone); be beneficial to; do good
Transitive use: the subject brings benefit to someone or something. Formal tone.
新しい政策は国民を利するだろう。
The new policy will benefit the people.
suru verb (special), transitive verb
make good use of; take advantage of; exploit
Transitive use: to utilize something for one's own benefit. Can carry a neutral or slightly negative nuance of exploitation depending on context.
彼はその機会を利して昇進した。
He took advantage of the opportunity and got promoted.