If the cost price of 12 pens is equal to the selling price of 8 pens, the gain percent is ?
12
30
50
40
60
Profit % =
0, 2, 8, 14, ?, 34
1, 4, 2, 8, 6, 24, 22, 88, ?
1, 4, 9, 16, 25, ?
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