If the price of a notebook decreases by 25%, then a man can buy 5 more notebooks for ₹200. What is the new price (in ₹) of each notebook?

Let original price = P. New price = 0.75P. At ₹200: 200/(0.75P) − 200/P = 5. Solving: 200(1/0.75P − 1/P) = 5 → 200(4/3P − 1/P) = 5 → 200(1/3P) = 5 → P = ₹40/3. New price = 0.75 × 40/3 = 10. New price = ₹10.