Question

plzz solve all these three questions

Answer 1

$1). \: total \: watt \: of \: bulb \: \\ = > 40 \times 5 = 200watt \\ total \: hr. \: of \:1month(30day) \\ = > 30 \times 5 = 150 \: hr. \\ electrical \: energy \: used \: in \: one \: month. \\ = > 200 \times 150 = 30000 \: watt \: ph \\ = > \frac{30000}{1000} = 30kwph \\ w.k.t. \\1 \: unit = 1kwph(1000wph) \\ now. \\ 30kwph = 30unit = 30rupees$
I hope it will helps you