Question

The cost of 5 pencils is equal to the selling of 4 pencils,find the gain percent.
I will mark brainliest....

Answer 1

Gain = 5 - 4 /4  x 100 = 1/4 x100 = 25  %

Its a trick .

Now explanation,

Let the cp of 5 obj . be x .

cp of 1 obj. = x/5

now

sp of 4 obj = x

sp of 1 obj = x/4

Gain = x/4 - x/5 = x/20

Gain % = x/20 x 5/x × 100  = 25%

Answer 2

Let the C.P of 5 pencils be X .

Therefore, S.P of 4 pencils is also X.

So, the C.P of 1 pencil is X/5 and the S.P of 1 pencil is X/4.

Therefore ,
PROFIT = S.P - C.P
= X/4 - X/5
= (5X - 4X)/20
= X/20
THEREFORE, Profit % = Profit / C.P ×100 %
= X/20×5/X × 100%
= 5%.