A merchant marks the price of his articles 20% above the cost price. If he allows 20% discount, then what is the profit or loss percentage? एक व्यापारी अपनी वस्तुओं की कीमत लागत मूल्य से 20% से ऊपर अंकित करता है । यदि वह 20% छूट की अनुमति देता है, तो लाभ या हानि प्रतिशत क्या है?

Let CP = Rs. 100. Marked Price (MP) = 100 + 20% = Rs. 120. After 20% discount, SP = 120 - 20% of 120 = 120 × 0.8 = Rs. 96. Loss = CP - SP = 100 - 96 = Rs. 4, which is 4% of CP. This is a classic case where equal markup and discount percentages still result in a loss because the discount is calculated on the higher marked price.