A household uses the following electrical appliances in a 30-day month:
• Five LED lamps, each 60W, switched on for 4h daily.
• One refrigerator of power 400W, in operation for 12h daily.
• One air-conditioner rated 1.5kW, run for 5h daily.
The electricity tariff is Rs.5.00 per unit for the first 100 units and Rs.7.50 per unit for all additional units in the month.
(i) Calculate the total electrical energy consumed by each appliance in the month, expressing the answers in kilowatt-hours.
(ii) Find the total energy consumed by the household in the month.
(iii) Determine the monthly electricity bill for the household according to the given tariff slab.