"15%" refers to a percentage that represents a fraction of a whole. In mathematical terms, it means 15 out of every 100 parts. This concept is commonly used in various contexts, such as finance, statistics, and everyday calculations. For example, if you have a total of 100 dollars, 15% would equal 15 dollars. In practical applications, 15% can indicate discounts, tax rates, or interest rates. For instance, if a store offers a 15% discount on a product priced at 100 dollars, the discount would reduce the price by 15 dollars, making the final cost 85 dollars. Understanding percentages like 15% is essential for making informed financial decisions.