Mastering Percentage Calculations
Percentages are a way of expressing a number as a fraction of 100. They are essential for understanding financial data, taxes, tip calculations, and statistical changes.
Percentage Increase and Decrease
To calculate the percentage change between two values, use this formula:
((New Value - Old Value) / |Old Value|) * 100
A positive result indicates an increase, while a negative result indicates a decrease (often used in calculating discounts or losses).
Common Use Cases
- Sales & Retail: Calculating 15% off a retail price.
- Finance: Determining the percentage growth of an investment portfolio.
- Statistics: Comparing the relative size of different data sets.