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Two electric bulbs rated 60 W and 40 W r...

Two electric bulbs rated 60 W and 40 W respectively are used 5 hours per day for 20 days. If the cost of a unit is ₹ 4.00 , find the cost of the energy used.

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An electric bulb rated 60 W and 40 W respectively are used 5 hours per day for 20 days . If the cost of a unit is Rs. 4.00, find the cost of the energy used.

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