Question

If the cost price of 10 copies is equal to the selling price of a copies. Find the gain or loss percent for shopkeeper.

please give me answer in step by step instructions.
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Answer 1

Answer:

Let the C.P. be

′

x

′

& S.P. be

′

y

′

then 10x=9y ...(1) .. as given

Profit =

x

y−x

×100

=(

x

y

−1)×100

From (1)

Profit=(

9

10

−1)×100

=

9

100

%=11

9

1

%.