If Kayla left a $10.47 tip on a breakfast that cost $87.25, what percentage was the tip?

Solution:
1. Formula for the percentage of the tip:
- \text{Percentage of Tip} = \left(\frac{\text{Tip Amount}}{\text{Total Cost}}\right) \times 100
2. Substitute the given values:
- Tip Amount = USD10.47
- Total Cost = USD87.25
3. Calculate the percentage:
- \text{Percentage of Tip} = \left(\frac{10.47}{87.25}\right) \times 100
4. Simplify the expression:
- \text{Percentage of Tip} = 0.12 \times 100
5. Final result:
- \text{Percentage of Tip} = 12\%