Question

plz answer it guys it's physics​

Answer 1

Total power consumed is,

$\displaystyle\longrightarrow\sf{P=400\ W+100\ W}$

$\displaystyle\longrightarrow\sf{P=500\ W}$

$\displaystyle\longrightarrow\sf{P=0.5\ kW}$

The time taken for consumption in one day,

$\displaystyle\longrightarrow\sf{t=10 h}$

Then the electric energy consumed in one day is,

$\displaystyle\longrightarrow\sf{E=0.5\times10}$

$\displaystyle\longrightarrow\sf{E=5\ kWh}$

Then for 10 days, the total energy consumed is,

$\displaystyle\longrightarrow\sf{E'=5\ times 10\ kWh}$

$\displaystyle\longrightarrow\sf{E'=50\ kWh}$

Cost of consuming $\displaystyle\sf{1 kWh}$ energy,

$\displaystyle\longrightarrow\sf{Rs. \ 8.00}$

So the cost of consuming $\displaystyle\sf{50kWh}$ energy,

$\displaystyle\longrightarrow\sf{Rs. \ 8.00\times50}$

$\displaystyle\longrightarrow\sf{\underline{\underline{Rs. \ 400.00}} }$