Each table to a profit of 20- - - zen and - frac - 10 - text - By selling - 12 text - dozen pens- Raman lost an - - - text - amount equal to the S-P- of - 6 text - pens- Find his - - - gain or loss per cent-

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each table to make a profit of 20\( \% \) zen and \( \frac { 10 . \text { By selling } 12 \text { dozen pens, Raman lost an } } { \text { amount equal to the S.P. of } 6 \text { pens. Find his } } \) gain or loss per cent.