Question

a shopkeeper on selling a pen for rs 18 ,loses 1/10 of what is costs him . his cost price is

Answer 1

Cost price - Selling price = loss

here

S.p = C.p - 1/10*c.p

18 = cp - cp/10

cp = 20

hence cost price is rupees 20

Answer 2

Given : A shopkeeper on selling a pen for rs 18 ,loses 1/10 of what is costs him.

To find : The cost price.

Solution :

We can simply solve this mathematical problem by using the following mathematical process. (our goal is to calculate the cost price)

Let, the cost price = Rs. x

So, the loss amount will be :

= x × (1/10)

= Rs. x/10

And, the selling price will be :

= Cost price - Loss amount

= x - (x/10)

= (10x - x)/10

= Rs. 9x/10

According to the data mentioned in the question,

9x/10 = 18

x = 18 × 10/9

x = 20

So, the cost price is = Rs. x = Rs. 20

(This will be considered as the final result of the given mathematical problem.)

Hence, the cost price is Rs. 20