a hawker gains the selling price of 4 ball point pens on selling 1 dozen pens video
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Let Rs x be the SP of each pen
SP of 12 pens = ₹ 12x
Gain=SP of 4 pens = ₹ 14x
CP = SP -Gain
12x - 4x = ₹ 8x
Gain % = Gain /CP ×100
4x/8x ×100%
ANSWER =50%
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