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Answers
Solution:-1w means 1joule of energy is consumed in 1sec
since 60w of 5 balls are on for 6hrs
total energy consumed by these five bulbs =5×60×3600×6=>6480000j=6480kj....i)
energy consumed by 4, 100w bulb per day=4×100×3600×5=7200000
=7200kj........ii)
energy consumed by two TV=200×2×8×3600=11520000j
=11520kj.........iii)
energy consumed by all the electrical appliances
in one day=(6480+7200+11520)kj=25200kj
energy consumed by all the electrical appliances in month of September=30×25200=756000kj
As we know, 1kwh=1unit
1kwh=3.6×10^6j
total KWH in 1 month=756000×10^3/3.6×10^6
=756×10^5/3.6×10^6
=210unit
total cost in one month=210×1.8=378
hence RS 378 is the total cost in one months
{hope it helps you}