By selling 100 pens, a shopkeeper gains the selling price

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By selling 100 pens, a shopkeeper gains the selling price of 40 pens. Find his gain percent.

1. 4.47%
2. 6.67%
3. 8.8%
4. 5.59%
5. None of the above

Correct Option: E

(SP of 100 pens) - (CP of 100 pens) = SP of 40 pens
⇒ SP of 60 pens = CP of 100 pens.

Let CP of each pen = ₹ 1
Then, CP of 60 pens = ₹ 60
SP of 60 pens = ₹ 100

Gain = 100 - 60 = ₹ 40
∴ Gain % = (40/60) x 100 % = 66.67%