- 20%
- 25%
- 30%
- can't be determined
- none of these

Option 3 : 30%

**Given:**

MP is 70% more than CP

Discount = 9%

**Formula used**:

Gain = SP - CP

Gain % = gain / CP × 100

**Calculation:**

Let MP of the article = RS. x

CP of the article = (x × 70) /100

⇒ 70x / 100

SP of the article = x × (100 - 9) / 100

⇒ 91x / 100

⇒ (91x/100) - (70x/100)

⇒ Rs. 21x / 100

Hence , gain % = (21x/100) / (70x/100) × 100

⇒ 21 / 100 × 100 / 70 × 100

⇒ 30%

**∴ Gain percentage is 30%**

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