A shopkeeper offers a festive offer: buy any three shirts, get two free. Find the equivalent percentage discount for the offer.

Correct option is D

Given:
Offer: Buy 3 shirts, get 2 shirts free.
Formula Used:
​$$\text{Equivalent Discount (\%)} = \left( \frac{\text{Value of Free Items}}{\text{Total Value without Offer}} \right) \times 100$$​​
Solution:
Let the cost of one shirt be Rs. 100
Cost of 3 shirts = 3 × 100 = Rs. 300
Free shirts = 2 × 100 = Rs. 200
Total value of 5 shirts = Rs. 500
Value of free items = Rs. 200
Equivalent Discount (%) = $$\frac{200}{ 500}$$​× 100 = 40%
Therefore, the equivalent percentage discount is 40%.