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:

CP of note books =₹600

the gain desire on the whole=10%

• therefore, total DP of the whole books=

100/(100+10) *600=₹660

• Cp of 1/4 of the book=1/4*600=₹150
• loss on it 5%

therefore, Sp of it =100/100-5*150=₹142.5

• Cp of remaining note books =₹600-150=450
• So of remaining note books=₹660-142.5=₹517.50

Ans-₹517.50