Question

Mohan bought a certain number of notebooks for rs600.He sold 1/4of them at 5 percent loss.Atwhat price should he sell the remaining notebooks so as to gain 10percent on the whole.

Answer 1

 
let total no of books be 100
cost of each book = 600/100
= 6
He sold ¼ of them at 5% loss
i.e he sold 25 ( 1/4 of 100 =25) books for 5 % loss
so he sold each notebook at = 6-5% of 6
=6-(5/100)6
=6-(30/100)
=6-0.3

=5.7
so he sold each book at Rs 5.7
total amount he got after selling 25 books @5.7 = 25*5.7
= 142.5 


he wants to get 10 % Profit on the whole
the amount he should get = 600+ 10 % of 600
= 600+(10/100)*600
= 600+60
=660
already he got Rs 142.5
so needs to get remaining (660-142.5) amount by selling 75 books
selling price of 75 book should be = 660-142.5
= 517.5
selling price of each book =517.5/75
= 6.9
Result :he should sell the remaining books at Rs 6.9 per book

Answer 2

Answer:₹517.50

Step-by-step explanation:

let total no of books be 100

cost of each book = 600/100

= 6

He sold ¼ of them at 5% loss

i.e he sold 25 ( 1/4 of 100 =25) books for 5 % loss

so he sold each notebook at = 6-5% of 6

=6-(5/100)6

=6-(30/100)

=6-0.3

=5.7

so he sold each book at Rs 5.7

total amount he got after selling 25 books @5.7 = 25*5.7

= 142.5 

he wants to get 10 % Profit on the whole

the amount he should get = 600+ 10 % of 600

= 600+(10/100)*600

= 600+60

=660

already he got Rs 142.5

so needs to get remaining (660-142.5) amount by selling 75 books

selling price of 75 book should be = 660-142.5

= ₹517.50

selling price of each book =₹517.50