A profit of 5% can be converted into loss of 5% if the selling price of a book is reduced by Rs 40 . The original selling price of book is

A profit of 5% can be converted into loss of 5% if the selling price o

1.	A profit of 5% can be converted into loss of 5% if the selling price of a book is reduced by Rs 40 . The original selling price of book is
Answer» k as brainlyStep-by-step explanation:Let the original list PRICE of the BOOK be=Rs xOriginal NUMBER of books purchased= x300 When the price of the book is REDUCED by 5New Number of books purchased will be= x−5300 New number of books purchased-Original number of books purchased=5∴ x−5300 − x300 =5⇒ x(x−5)300x−300x+1500 =5⇒x 2 −5x=300 ⇒x 2 −20x+15x−300=0 ⇒x(x−20)+15(x−20)=0 ⇒(x−20)(x+15)=0 ⇒x−20=0orx+15=0⇒x=20orx=−15 ∴x=20the original cost of book is Rs 20