Question

find the cost price , if S.P is ₹21 and gain is 5%​

Answer 1

Answer:

The cost price is 20.

Step-by-step explanation:

We have to find the cost price. Let us assume, Cost price is 100 %

As gain is 5% , selling price is: (100 + 5) % = 105

%

Selling price is given 21.

Hence, 105 % is 21

So, 1% is: 21/105

And 100 % is: (21/105) x 100 = 20 So the cost price is 20. (Answer)

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Answer 2

CP = 100/100 + Gain % × SP/1

100/100 + 5 × 21/1

100/105 × 21/1

100/5 × 1/1

= 20

Hence CP is 20 Rupees

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