Average = SUM / COUNT.
That is, you add the items you want to average, then divide by the total number of items.
The average of 100 and 67 is 83.5, because that’s 167/2.
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Percent change is DIFFERENCE / ORIGINAL.
When they calculated the percent growth, they did 250-140 = 110, that’s the “difference” for the numerator.
The “original” number is 140, because 2021 is before 2022.
So we do 110/140 = 0.786
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