An electric lamp is marked $60\, W$, $230\, V$. The cost of a $1\, kWh$ of energy is Rs. $1.25$. The cost of using this lamp $8$ hrs a day for $30$ day is Rs. ...............
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(c) Total kWh consumed $ = \frac{{60 \times 8 \times 30}}{{1000}} = 14.4$
Hence cost $ = 14.4 \times 1.25 = 18\,Rs$
Hence cost $ = 14.4 \times 1.25 = 18\,Rs$
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