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 144 and 84 is 60 (144 - 84 = 60).

Next, we need to find the average of the two numbers. The average of 144 and 84 is (144 + 84) / 2 = 114.

Now, we can find the percentage difference by dividing the absolute difference by the average and multiplying by 100. So, the percentage difference between 144 and 84 is (60 / 114) x 100 = 52.63%.

This means that 144 is 52.63% greater than 84, or that 84 is 34.78% less than 144.