An electric bulb of 60 watt is lighted for 10 hours a day. What is the amount to be paid in a month of 30 days ,if one unit costs Rs 3.50?

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Solution

Dear Student ,
$E l e c t r i c a l e n e r g y c o n s u m e d = \frac{60 \times 10 \times 30}{1000} = 18 K W h S o t h e \cos t = 3 \cdot 5 \times 18 = 63 r u p e e s$

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