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500₹ for 125 watts
1 watt=(500/125) ₹=4₹
as per no. of watts for 400 watts total money is 400*4=1600 and for 500 watts 2000₹ respectively
an extra charge is added that is x₹
so, 1600+x:2000+x=21:25
21(2000+x) =25(1600+x)
42000+21x=40000+25x
2000=4x
500=x
extra charge that is fixed for service is ₹500
hope u understood any doubt msgg
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sorry bro ykskskxifjrifodkskc
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