Step pricing calculation (calculating electricity consumption).

Ladder electricity pricing is a method of calculating electricity usage that charges different rates for different levels of consumption. Typically, the more electricity that is consumed, the higher the rate that is charged. This is designed to encourage people to conserve energy and reduce their overall electricity usage. The exact pricing structure varies depending on the region and the electricity provider, but the general principle remains the same. Customers are charged a set amount per kilowatt-hour (kWh) of electricity used, with the rate increasing as their consumption climbs higher up the ladder.