Tips & TricksGiven On selling article for Rs 51 more, Vishnu is getting 3% more profit. Formula Selling price = Cost price × [(100 + Profit%)/100] Calculation Let CP be 100x. SP1=100x×(125/100)=125x SP2=100x×(128/100)=128x According to question 128x−125x=51 ⇒3x=51 ⇒ x = 17 ∴ Cost price =100x=100×17=1700.