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 230 and 275 is 45.

Next, we need to find the average of the two numbers. The average of 230 and 275 is (230+275)/2 = 252.5.

Now, we can find the percentage difference by dividing the absolute difference by the average and multiplying by 100. So, the percentage difference between 230 and 275 is (45/252.5) x 100 = 17.8%.

This means that the second number, 275, is 17.8% higher than the first number, 230.