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 149 and 108 is 41 (149 - 108 = 41).

Next, we need to find the average of the two numbers. The average of 149 and 108 is (149 + 108) / 2 = 128.5.

Now, we can calculate the percentage difference by dividing the absolute difference by the average and multiplying by 100. So, the percentage difference between 149 and 108 is (41 / 128.5) x 100 = 31.9%.

Therefore, the percentage difference between 149 and 108 is 31.9%. This means that 108 is 31.9% less than 149, or that 149 is 31.9% more than 108.