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Question
A trader while buying takes 20% extra but while selling, gives 20% less. He claims to make 10% profit on this transaction. Find the actual gain made by the trader.
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Answer
100=120 buying
80=100 selling
by selling 100=10/8
120*10/8;30*5=150
profit=(150-80)/80*100;7/8*100
87.5
