Step-by-step arithmetic breakdown
To calculate 20% of 40, 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 × 40
3. Exact result: 8
Everyday real-world applications
- Retail & Discounts: If a product priced at $40 is discounted by 20%, your savings equal $8.
- Tax & Tips: A 20% service tip on a $40 restaurant bill equals exactly $8.
- Financial Yields: An investment yielding 20% on a principal of $40 produces $8 in interest.