A cloth dealer professes to sell cotton at cost price, but uses a meter having a length of $80\, cm$ only and charges for the meter. Find his gain percent.
A cloth dealer professes to sell cotton at cost price, but uses a meter having a length of $80\, cm$ only and charges for the meter. Find his gain percent.
- A
$25$
- B
$30$
- C
$40$
- D
None of these
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