5. A dealer is selling an article at a discount of 15%. Find
(i) the selling price if the marked price is 500;
(ii) the cost price if he makes 25% profit.
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Discount=15×500/100 =75 Rs
So SP=500-75=425rs
Profit%=Profit×100/Cp
Profit=Sp -cp
Profit%=(Sp-cp)×100/cp
25=(425-cp)100/cp
25cp=42500-100cp
125cp=42500
cp=42500/125 =340rs
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