Question

If the profit made by selling a pen for rs.10 is as much as its cost, what is the cost price of the pen ?

Answer 1

Let the C.P of a pen= x

Given:

Selling price (S.P) of a pen= ₹ 10

Profit = cost price (C.P)

S.P - C.P = C.P

[Profit = S.P - C.P]

10 - x = x

10 = x+x

10 = 2x

x= 10/2

x= 5

C.P =₹ 5

Hence, the cost price of the pen is ₹ 5.

==================================================================
Hope this will help you...

Answer 2

Given Data:
Selling price of a pen = S.P = Rs. 10
Also given that the profit made by selling a pen is as much as its cost.
Hence, 
Profit = C.P (Cost Price)   .......... (1)
We have to find the cost price of the pen.
i-e, 
C.P of a pen = ?
Solution:
Let cost price of pen = x
We know that,
S.P - C.P = Profit
S.P - C.P = C.P  (Using equation (1))
S.P = C.P + C.P
10 = x + x
10 = 2x
x = 10 / 2
x = 5
Which shows that the cost price of pen is Rs. 5
Hope it will help you. Thanks.