Step-by-step arithmetic breakdown
To calculate 20% of 20, convert the percentage into a decimal by dividing by 100, then multiply by the whole amount:
1. Convert percentage to fraction: 20 / 100 = 0.2000
2. Multiply by base number: 0.2000 × 20
3. Exact result: 4
Everyday real-world applications
- Retail & Discounts: If a product priced at $20 is discounted by 20%, your savings equal $4.
- Tax & Tips: A 20% service tip on a $20 restaurant bill equals exactly $4.
- Financial Yields: An investment yielding 20% on a principal of $20 produces $4 in interest.