UPSC CDS Math Profit and Loss Questions

Let the selling price of the cloth be ₹ 100
The gain of the cloth merchant would be the amount that he makes by selling 20 m of the cloth (10 m from the weaver and 10 m from the customer)
Selling price of 90 m cloth = ₹100
∴ Selling price of 1 m cloth =

100

90

=

10

9

⇒ Selling price of 20 m cloth =

10

9

×20=

200

9

Therefore, gain percent of the clothmerchant =

200 9

100

×100%
=

200

9

%=22

2

9

%