His new computer uses 800*.5=<<800*.5=400>>400 watts more than his old computer
So it users 800+400=<<800+400=1200>>1200 watts
That is 1200/1000=<<1200/1000=1.2>>1.2 kw
Electricity cost 12*.25=<<12*.25=3>>3 cents more than it used to
So it now cost 12+3=<<12+3=15>>15 cents per kwh
He used 1.2*50=<<1.2*50=60>>60 kwh
So he paid 15*60=<<900=900>>900 cents per kwh
So he paid 900/100=$<<900/100=9>>9
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