Assuming you want to know what 2 out of 5 is as a percentage, this would be 40%. To calculate this, you divide the number of items in question (2) by the total number of items (5). This will give you the decimal answer of 0.4. You then multiply that answer by 100 to get the percentage. In other words, the equation would look like this:
So what percentage is 2 of 5? The answer is 40%.