Key Concepts
- A percentage increase means adding a certain percentage to the original value.
- A percentage decrease means subtracting a certain percentage from the original value.
- Formula: New Value = Original Value × (1 ± percentage as a decimal).
Skills Covered
- Calculate the increased or decreased value after a percentage change.
- Work with real-world applications (e.g., population growth, price discounts).
Example Problems
- A population of 1,000 increases by 20%. What is the new population?
- A shirt originally costs $50 and is 30% off. What is the sale price?
- The price of a stock decreased by 15% from $200. What is the new price?