To find the percentage difference between two numbers, we first need to find the absolute difference between them. In this case, the absolute difference between 111 and 89 is 22 (111-89=22).

Next, we need to find the average of the two numbers. The average of 111 and 89 is (111+89)/2 = 100.

Now, we can calculate the percentage difference by dividing the absolute difference by the average and multiplying by 100. So, the percentage difference between 111 and 89 is (22/100) x 100 = 22%.

Therefore, the percentage difference between 111 and 89 is 22%. This means that 89 is 22% less than 111, or that 111 is 22% more than 89.