By selling an article for rupees 1600 A shopkeeper lost 20% for how much should he sell it to gain 20%
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cp of article ={ 100/100-loss%}×sp
100/100-20×1600
100/80×1600
2000
cp= 2000, gain= 20%
sp = 100+gain%/100×cp
100+20/100×2000
120/100+2000
2400
100/100-20×1600
100/80×1600
2000
cp= 2000, gain= 20%
sp = 100+gain%/100×cp
100+20/100×2000
120/100+2000
2400
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