find cost price s.p is rs 678and gain 13%
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find cost price s.p is rs 678and gain 13%
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SP = 678
Gain = 13%
CP =?
SP = ( 100+gain%) /100 *CP
678 = ( 100.+ 13 /100 ) *CP
678 = 113 /!100 * CP
CP = 678* 100 / 113
CP = 67800 / 113
CP = 600