Question

By selling 20 pens a shop keeper’s gain is equal to selling 4 pens calculate his gain percent

Answer 1

25%

Explanation:

Given:

By selling 20 pens, a shopkeeper 's gain is equal to the selling price of 4 pens.

So,

20 ( Selling price - Cost price ) = 4 Selling price

5 ( Selling price - Cost price ) = Selling price

5 Selling price - 5 Cost price = Selling price

4 Selling price = 5 Cost price

Selling price = 5 cost price / 4

So,

Gain = Selling price - Cost price = 5 Cost price/4 - Cost price

= 5 Cost price − 4 Cost price / 4

= 1/4 Cost price

Gain %

= 1/4 Cost price / Cost price×100 = 100/4 = 25 %

ANSWER= 25%

Answer 2

The answer is 25% is the gain