A shopkeeper buys 11 hair clips for $10 and sells 10 clips for $11. Find out the gain or the loss percent.

(11/10) / (10/11) = 1.21

so, 21% gain

I 1.21 how can it will be 21

To find out the gain or loss percentage, we need to calculate the profit or loss first.

Let's start with the cost price. The shopkeeper buys 11 hair clips for $10, so the cost price of each clip can be calculated by dividing the total cost by the number of clips:

Cost price per clip = Total cost / Number of clips
= $10 / 11
= $0.91 (rounded to two decimal places)

Next, let's calculate the selling price. The shopkeeper sells 10 clips for $11, so the selling price of each clip can be calculated by dividing the total selling price by the number of clips:

Selling price per clip = Total selling price / Number of clips
= $11 / 10
= $1.10 (rounded to two decimal places)

Now, we can calculate the profit or loss per clip:

Profit or loss per clip = Selling price per clip - Cost price per clip
= $1.10 - $0.91
= $0.19 (rounded to two decimal places)

Since the selling price is higher than the cost price, the shopkeeper has made a profit per clip.

To calculate the profit or loss percentage, we use the formula:

Profit or loss percentage = (Profit or loss per clip / Cost price per clip) * 100

Let's substitute the values into the formula:

Profit or loss percentage = ($0.19 / $0.91) * 100
= 20.88% (rounded to two decimal places)

Therefore, the shopkeeper has made a profit of approximately 20.88%.