A washing machine rated 2kW is used for 1.5h every day.
a. (i) Calculate the electrical energy consumed in a 30-day month, in kWh.
b. (ii) Electricity costs Rs 6 per kWh during peak hours and Rs 4 per kWh during off-peak hours. If the machine is shifted entirely to off-peak hours, determine the monthly saving in the electricity bill.