The cost price of 12 articles is equal to the selling price of 9 articles while the discount (D) on 10 articles is equal to the profit (P) on 5 articles. Find the difference between profit % and discount %.
12×CP =9×SP CP/SP=3/4 Profit =1 Profit percentage = (1/3) ×100=33.33% 
Percentage of (D)= (0.5/4.5) ×100 =11.11% P% -D% =33.33% -11.11% =22.22%.
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