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A certain household has consumed 250 units of energy during a month. How much energy is this in joules?

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We know that 

                          1 unit = 3,600,000 J 

So,                     250 units = 250 × 3,600,000 J 

                                          = 900,000,000 J 

                                          = 9 × 108

Hence, the energy consumed = 9 × 108 J  

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