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 50 and 30 is 20 (50-30=20).

Next, we need to find the average of the two numbers. The average of 50 and 30 is (50+30)/2 = 40.

Now, we can calculate the percentage difference by dividing the absolute difference by the average and multiplying by 100. So, the percentage difference between 50 and 30 is (20/40) x 100 = 50%.

Therefore, the percentage difference between 50 and 30 is 50%. This means that 50 is 50% more than 30.