To find the percentage difference between two numbers, we first need to calculate the absolute difference between them. In this case, the absolute difference between 218 and 250 is 32.

Next, we need to find the average of the two numbers. The average of 218 and 250 is (218+250)/2 = 234.

Now, we can calculate the percentage difference by dividing the absolute difference by the average and multiplying by 100. So, the percentage difference between 218 and 250 is (32/234) x 100 = 13.68%.

This means that the second number, 250, is 13.68% higher than the first number, 218.