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A dealer get Rs 30 less if instead of selling a chair at 12% gain he sells it at a gain of 8%. Find the cost price of the chair.

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`SP at(12%)=C+12%of C=C+12/100C=28/25C`
`SP at(8%)=C+8% of C=C+8/100C=27/25C`
SP at (12%)-SP at (8%)=30
`28/25C-27/25C=30`
C=750Rs.

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