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We know we will need gain amount to get gain percent, right. So lets get gain first.
Let the cost price of 1 pen is Re 1
Cost of 4 pens = Rs 4
Selling price of 4 pens = 6
Gain = 6- 4 = 2
Gain%=(Gain/Cost∗100)%=(2/4)%=50%

therefore, CP of 1 pen = x/6

SP of 4 pens = CP of 6 pens= x

therefore, SP of 1 pen = x/4

therefore, gain = (1/4-1/6)x [L.C.M = 12]

= [(3-2)12]x

= 1/12 x

gain percent = (gain / CP)*100

= [(x/12)/(x/6)]*100

= (x/12)*(6/x)*100 [ both the x gets cancelled ]

= (1/2)*100

= 50 %

Answer : gain made by selling 1 pen = 50 %