The cost price of a book is Le 9,000 and the selling price is Le 12,000. The mark up s

The mark-up is the percentage difference between the selling price and the cost price of a product. To calculate the mark-up percentage, we use the formula: Mark-up percentage = (Selling price - Cost price) / Cost price x 100% In this case, the cost price of the book is Le 9,000 and the selling price is Le 12,000. So the mark-up percentage is: Mark-up percentage = (12,000 - 9,000) / 9,000 x 100% Mark-up percentage = 3,000 / 9,000 x 100% Mark-up percentage = 0.3333... x 100% Mark-up percentage = 33.33...% Therefore, the correct answer is 33\(\frac{1}{3}\)%. Option C, 33\(\frac{1}{2}\)%, is the closest option to the correct answer.