- 12%
- 12.5%
- 15%
- 15.5%

Option 2 : 12.5%

Given:

The cost price of 45 pens = Selling price of 40 pens

Formula used:

Profit % = [(S.P - C.P)/C.P] × 100

Calculation:

According to the question,

C.P × 45 = S.P × 40

⇒ C.P/S.P = 40/45

⇒ C.P/S.P = 8/9

Profit % = [(9 - 8)/8] × 100

⇒ (1/8) × 100

⇒ 12.5%

∴ The profit percentage is 12.5%

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