25. An electric bulb marked with 100V - 60W is used for 5 hours in a week. What is the cost of electricity if the rate is 3 Rupees per unit?
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Given, power, P image
Time, t = 5 × 7 = 35h
Rate of electricity = ₹ 3 per unit
∴ The energy consumed in a week = Pt = image
The cost of electricity at the rate of = ₹ 3 per unit is = 3 × 2.1 = ₹ 6.3
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