If the cost price of $21$ watches is equal to the selling price of $18$ pieces, then what would be the gain percent in this transaction?
If the cost price of $21$ watches is equal to the selling price of $18$ pieces, then what would be the gain percent in this transaction?
- A
$6 \frac{1}{2}$
- B
$7$
- C
$16 \frac{2}{3}$
- D
None of these
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