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प्रश्न
Find the cost price, if: S.P. = Rs. 21 and gain = 5%
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उत्तर
S.P. = Rs. 21 and gain = 5%
∴ C.P. = `("S.P." xx 100)/(100 + "gain %")`
`= (21 xx 100)/(100 + 5)`
`= (21 xx 100)/105` = Rs. 20
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