the amount that remains after a part is taken away.

a charge for services or material not previously accounted or billed.

अपरिचित शुल्क

English Usage: The residual charge for the contractor's additional work was unexpected.

Hindi Usage: ठेकेदार के अतिरिक्त काम के लिए अपरिचित शुल्क अप्रत्याशित था।