The estimated tip for 20% on a bill of $14.88 is $2.97.
Explanation: 2.97 is 20% of 14.88. To work it out, you first find 10% of the number. 10% of 14.88 is 1.488 or in money terms, $1.48. I know this because 10% of a number is going down a power of 10. For example, 10% of 1,000 is 100. 10% of 200 is 20. 10% of 30 is 3. Then to find 20% of a number, you double whatever the 10% is. So, 10% of 14.88 is 1.48, so 1.48 x 2 = 2.96. Then the answer of 20% of 14.88 is 2.97 because you round up.