Question

The certain household has a consumed 250 unit of energy during the month how much energy is this in Jouled

Answer 1

250×3.6×10^6

=9×10^8 joule

Answer 2

$\textbf{\underline{\underline{According\:to\:the\:Question}}}$    

1 unit = 1 kilowatt hour

${\implies 3.6\times 10^{6}\:Joule}$

Now

250 units = 250 kilowatt hour

${\implies 250\times 3.6\times 10^{6}\:Joule}$

${\implies 900.6\times 10^{8}\:Joule}$

${\implies 9\times 10^{8}\:kJ}$