If the selling price of $50$ articles is equal to the cost price of $40$ articles, then the loss or gain percent is
If the selling price of $50$ articles is equal to the cost price of $40$ articles, then the loss or gain percent is
- A
$20 \%$ loss
- B
$20 \%$ gain
- C
$25 \%$ loss
- D
$25 \%$ gain
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