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 247 and 300 is 53 (300 - 247 = 53).

Next, we need to find the average of the two numbers. The average of 247 and 300 is (247 + 300) / 2 = 273.5.

Now, we can calculate the percentage difference by dividing the absolute difference by the average and multiplying by 100. So, the percentage difference between 247 and 300 is (53 / 273.5) x 100 = 19.36%.

Therefore, the percentage difference between 247 and 300 is 19.36%. This means that the difference between the two numbers is 19.36% of their average value.