Teaching Bihar STET Paper 1 (माध्यमिक) Mock Test 2024 General Science Physics Work Power Energy

What would be the expenditure in 30 days at the rate of 75 paise per unit, if a bulb of 100 W is used five hours per day?

1
Rs. 10
2
Rs. 7.5
3
Rs. 15
4
Rs. 11.25
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