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यदि 100 वाट का एक बल्ब प्रतिदिन 15 घंटे जलाया जाता है तो 30 दिन में 50 पैसे प्रति यूनिट की दर से विद्युत का क्या खर्च आएगा?

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यदि 100 वाट का एक बल्ब प्रतिदिन 15 घंटे जलाया जाता है तो 30 दिन में 50 पैसे प्रति यूनिट की दर से विद्युत का क्या खर्च आएगा?






 
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