This is the 1410th most frequent Korean word.
요금
Fee; charge; fare.
In this sentence, '요금' (fare) is used to refer to the money required to use a service, specifically the bus service.
이 버스 요금은 얼마인가요?
How much is the bus fare?
Here, '요금' (charge) indicates the cost associated with using a utility service, in this case, electricity.
전기 요금이 이번 달에 올랐습니다.
Electricity charges increased this month.
In this usage, '요금' (fee) is describing a monetary amount required for an additional service, such as a late checkout at a hotel.