Question

pens are bought at 12 for a rupee and sold 9 for a rupee find gain or loss %

Answer 1

Since the question is not clear regarding the number of pens, I assume the number of pens sold to be one.

Cost Price of Pen = Rs. 12

Selling Price of Pen = Rs. 9

Since Cost Price > Selling Price, the sale is considered to be a loss.

Loss % = ( Loss / CP ) * 100

Loss = SP - CP

=> Loss = Rs. 12 - Rs. 9 = Rs. 3

=> Loss % = ( Rs. 3 / Rs. 12 ) * 100

=> Loss % = 100 / 4 = 25%

Hence the Loss percent associated with the sale is 25%.

Hope my answer helped !

Answer 2

Hey friend

Here is your answer

C.P of pen is 12
S.P of pen is 9
If C.P is <S.P then there is loss

So,Loss = C.P-S.P
=12-9
=3

Loss% = Loss/C.P ×100
= 3
-- × 100
12
=25%