The cost at $5$ paise per KWH of operating an electric motor for $8$ hours, which takes $15$ ampere at $110 V$ , is $11 y$ paise, Calculate $y$

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Solution

Total energy consumed for $8$ hours
=Voltage (V) $\times$ Current (i) $\times$ time (t)
$= 15 \times 110 \times 8 \times 10^{- 3}$
$= 13.2 KWH$
Total cost $= 13.2 \times 5 = 66$ paise
$∴ 11 y = 66$
$\Rightarrow y = \frac{66}{11} = 6$

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