Correct Answer - Option 3 : 20%
Given∶
A shopkeeper starts an offer “Buy 4 Get 1 free”.
Formula Used∶
Discount = Marked Price – Selling Price
Discount % = Discount / Marked Price × 100
Calculation∶
Let the price of 1 article be x
Total quantity = 4 + 1 = 5
Number of articles buy = 4
Marked price of 5 article = 5x
SP of 4 article = 4x
Discount = M.P – S.P = 5x – 4x = x
Discount % = (Discount / M.P.) × 100 = (x / 5x) × 100 = 20 %
∴ The net percentage of discount is 20%.