What percentage of numbers from 1 to 30 has 1 or 9 in the unit's digit?Choices:- 121 15 20 22

To solve this problem, we need to count how many numbers from 1 to 30 have 1 or 9 in the unit's digit.

Step 1: Identify the numbers with 1 or 9 in the unit's place. These are: 1, 9, 11, 19, 21, and 29. That's a total of 6 numbers.

Step 2: Calculate the percentage of these numbers out of the total numbers from 1 to 30. The total numbers from 1 to 30 is 30.

Step 3: Use the formula for calculating percentage which is (part/whole) * 100. So, (6/30) * 100 = 20%.

So, 20% of numbers from 1 to 30 have 1 or 9 in the unit's digit. The correct answer is 20.