Question

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 1

plz mark as brainly

Step-by-step explanation:

Let the original list price of the book be=Rs x

Original number of books purchased=

x

300

When the price of the book is reduced by 5

New Number of books purchased will be=

x−5

300

New number of books purchased-Original number of books purchased=5

∴

x−5

300

−

x

300

=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=20

the original cost of book is Rs 20