21. In a house 5 bulbs of 25 W each are used for 6 hours a day. Calculate the units of electricity
consumed in a month for 30 days. Also find the total expenditure if 1 unit of electricity costs 1.5 rupees
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Answer:
Energy =(125×6×30)÷100
=22.5 units
Cost =22.5×1.50
=33.75 rupees
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