your bill comes to $23.55 at a restaurant. how much money should you leave for a 15% tip for good service? How much money should you leave for a 20% tip for excellent service?

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To calculate the amount of tip to leave, you need to multiply the bill amount by the tip percentage. Here's how to calculate it:

1. Calculate the 15% tip for good service:
- Multiply $23.55 by 0.15 (which is the decimal equivalent of 15%): $23.55 * 0.15 = $3.5325
- Round the result to the nearest cent: $3.53
- So, for a 15% tip, you should leave $3.53.

2. Calculate the 20% tip for excellent service:
- Multiply $23.55 by 0.20 (which is the decimal equivalent of 20%): $23.55 * 0.20 = $4.71
- Round the result to the nearest cent: $4.71
- So, for a 20% tip, you should leave $4.71.

In summary:
- For good service, leave approximately $3.53 as a 15% tip.
- For excellent service, leave approximately $4.71 as a 20% tip.