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To solve the problem, we need to estimate a 20% tip on a bill of $78.05 by rounding to the nearest dollar first.

1. **Round $78.05 to the nearest dollar:**
   \[
   78.05 \approx 78
   \]

2. **Calculate 20% of $78:**
   \[
   20\% \times 78 = \frac{20}{100} \times 78 = 15.6
   \]

So, the estimated tip is approximately **$15.60**.

Would you like more details or have any questions?

Here are 5 related questions:
1. How would the tip change if the bill were $82 instead of $78?
2. What is the exact 20% tip on the original bill of $78.05?
3. How do you calculate tips for different percentages, such as 15% or 25%?
4. What happens if you round the bill up instead of down?
5. How would you calculate the total amount paid, including the tip?

**Tip:** Always double-check whether the percentage is applied before or after rounding when estimating tips.

Estimate the amount of the tip by rounding the bill to the nearest dollar before calculating. 20% tip on a bill of $78.05. The amount of the tip is approximately ______.

Learn how to estimate a 20% tip on a bill of $78.05 by rounding to the nearest dollar. This involves rounding the bill, calculating the percentage, and estimating the final tip. Suitable for students in Grades 5-7.

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