The cost price of 12 pens is equal to the selling price of 15 pens. the loos persent is.
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12CP=15SP
4CP=5SP
CP:SP = 5:4
5(CP)----4(SP)
Loss= 1
Loss%= 1/5 *100 = 20%
4CP=5SP
CP:SP = 5:4
5(CP)----4(SP)
Loss= 1
Loss%= 1/5 *100 = 20%
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