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 80 and 136 is 56 (136 - 80 = 56).

Next, we need to find what percentage this absolute difference represents in relation to the original number. To do this, we divide the absolute difference by the average of the two numbers (80 and 136), and then multiply by 100 to get the percentage.

So, the average of 80 and 136 is (80 + 136) / 2 = 108.

Now, we divide the absolute difference (56) by the average (108) and multiply by 100 to get the percentage difference:

(56 / 108) x 100 = 51.85%

Therefore, the percentage difference between 80 and 136 is 51.85%. This means that 136 is 51.85% more than 80.