Step-by-step arithmetic breakdown
To calculate 18% of 40, convert the percentage into a decimal by dividing by 100, then multiply by the whole amount:
1. Convert percentage to fraction: 18 / 100 = 0.1800
2. Multiply by base number: 0.1800 × 40
3. Exact result: 7.2
Everyday real-world applications
- Retail & Discounts: If a product priced at $40 is discounted by 18%, your savings equal $7.2.
- Tax & Tips: A 18% service tip on a $40 restaurant bill equals exactly $7.2.
- Financial Yields: An investment yielding 18% on a principal of $40 produces $7.2 in interest.