An immersion rod of 1500 watt is used 3 hour daily for heating the water. If the cost electricity is Rs 5.00 per unit, then calculate the cost of electricity consumed in 30 days.
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solution
given
100 watt = 1unit
1500watt =15unit
now
in 1 day the cost of electrical energy is =15 ×5.00
= rs 75
in 30 day the cost of electrical energy is =15 ×5.oo×30
= rs 2250
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