Correct Answer - Option 2 : 50

**Given:**

SP = Rs. 25

Value of loss% = CP

**Formula used:**

Loss% = [(CP – SP)/CP] × 100

Where CP = Cost Price, SP = Selling Price

**Calculation:**

Loss% = [(CP – SP)/CP] × 100

As per given in the question we put

Loss% = [(CP – SP)/CP] × 100

⇒ CP^{2} = (CP – SP) × 100

⇒ CP^{2} = (CP – 25) × 100

⇒ CP^{2} = 100CP – 2500

⇒ CP^{2} – 100CP + 2500 = 0

⇒ CP^{2} – 50CP – 50CP + 2500 = 0

⇒ CP(CP - 50) – 50(CP – 50) = 0

⇒ (CP – 50)(CP - 50) = 0

⇒ CP = 50

**∴ Cost price of the article is Rs. 50.**