- 10%
- 12.5%
- 11.11%
- 13.25%

Option 2 : 12.5%

Given:

By Selling 40 pens gain cost price of 5 pens

Formula used:

Gain = Selling Price(SP) - Cost Price(CP)

Gain% = (Profit/CP) × 100

Calculation:

The student bought 40 pens and sold 40 pens

According to the question

SP of 40 - CP of 40 = 5 CP

Gain = 5 CP

Gain% = (5CP/40CP) × 100 = 12.5%

∴ The gain percent is 12.5%

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