Question

The selling price of 10 pens is equal to the cost price of 11 pens. Find the gain percent. ​

Answer 1

Answer:

Let the price of 1 pen = ₹ 10

S.P = 100

C.P = 110

S.P < C.P = loss

loss = ₹ 10

loss % = loss x 100/C.P

loss % = 10 x 100/110

loss % = 100/11

loss % = 9% approx

Answer 2

$\huge\bold\color{blue}{\underbrace{\overbrace{\mathfrak{\color{red}{✍Answer⭐}}}}}$

Let S.P. of each pen bex.

S.P. of 10 pens = 10x

S.P. of 11 pens = 11 x

Given : C.P. of 11 pens = S.P. of 10 pens =10 x

Here, S.P. > C.P.

∴ Profit = S.P. −C.P= 11 x − 10 x = x

Percentage Profit =

$\color{green}{\boxed{ \bold {\mathtt{ \implies\frac{Profit}{ Cost}× 100}}}}$

% Profit/ Gain =

$\bold {\mathtt{ \implies\frac{</strong><strong>x</strong><strong>}{ </strong><strong>10x</strong><strong> }</strong><strong>×</strong><strong>1</strong><strong>0</strong><strong>0</strong><strong>}}$

${ \boxed{ \color{brown}{ \mathtt{ \bold{ \implies \:</strong><strong>1</strong><strong>0</strong><strong>\%}}}}}$