If u have 13 peices of food and 2 peices are ate what is the percent of the 2 picese?

You see it is a very long number, but if you round the number it will be 15%. As you know we are not able to divide 13 to any number because it's a Prime Number which means that if we divide it to any number but 13 and 1, we will have left over numbers that will make a silly mess, so I just think it's better to round the number of the percentage to get a better answer.