An electricity meter shows a reading of 12 580 kWh at the beginning of a month and 12 840 kWh at the end.
Two tariff plans are available:
Plan A: First 200 units at Rs 5 per unit and the remaining units at Rs 8 per unit.
Plan B: A flat rate of Rs 6.50 per unit for the entire consumption.
(i) Determine the total energy consumed during the month.
(ii) Calculate the amount payable under each plan.
(iii) State which plan is cheaper for the consumer.