Estimate a 15% tip for each amount.

$9.89

$27.59

0.15 * 10 = $1.50

10% of 28 = 2.80
2.80 * 2 = 5.60

The tip should be about half way between 2.80 and 5.60

Thank you and I'm sorry for accidentally posting a few times. I'm truly sorry for asking the same question repeatedly because it said it wasn't submitting because there was no signal.

To estimate a 15% tip for any amount, you can follow these steps:

Step 1: Convert the percentage to a decimal by dividing it by 100. For example, 15% becomes 0.15.

Step 2: Multiply the original amount by the decimal form of the tip rate to calculate the tip amount.

Using these steps, we can estimate the 15% tip for the given amounts:

- For $9.89: 0.15 x $9.89 = $1.48
So, a 15% tip for $9.89 would be approximately $1.48.

- For $27.59: 0.15 x $27.59 = $4.14
Therefore, a 15% tip for $27.59 would be approximately $4.14.