Correct Answer - Option 4 : 16.66%

**Given****∶**

An offer, “Buy 5 get 1 free.”

**Formula Used****∶**

Discount = Marked Price – Selling Price

Discount % = (Discount / Marked Price) × 100

**Calculation****∶**

Let the price of article be ‘x’

Number of articles purchased = 5

Total number of articles gets = 5 + 1 = 6

M.P. of 6 articles = 6x

S.P. of 5 articles = 5x

Discount = M.P. – S.P.

⇒ 6x – 5x

⇒ x

Discount % = (Discount / M.P.) × 100

⇒ (x / 6x) × 100

⇒ 16.66%.

**∴ The overall discount percentage is 16.66%.**