3.
Calculate the monthly bill if the following appliances are used as indicated below at the
rate of Rs. 5 per unit.
a) a heater of 1000 W for 2 hours daily.
b) Ten 60 watt bulbs for 5 hours daily,
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Given : a) a heater of 1000 W for 2 hours daily.
b) Ten 60 watt bulbs for 5 hours daily,
To Find : monthly bill at the rate of Rs. 5 per unit.
Solution:
a heater of 1000 W for 2 hours daily.
=> Daily consumption = 1000 * 2 = 2000 Wh
= 2 kWh
= 2 units
Consumption in month = 30 * 2 = 60 units
Rate = Rs 5 per unit
=> Monthly bill = 60 * 5 = Rs 300
Ten 60 watt bulbs for 5 hours daily,
= 10 * 60 * 5 = 3000 Wh
= 3 kWh
= 3 units
Consumption in month = 30 * 3 = 90 units
Rate = Rs 5 per unit
=> Monthly bill = 90 * 5 = Rs 450
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