Add all the numbers together and divide by how many numbers there are. 300+600+500+300+300+600+500+500=3600 3600 divided by 8 is 450 the mean of these numbers is 450
Work out the difference (increase) between the two numbers you are comparing. Then: divide the increase by the original number and multiply the answer by 100. % increase = Increase ÷ Original Number × 100. If your answer is a negative number then this is a percentage decrease.
