From Robert Niles' website: Subtract the old value from the new value, then divide by the old value. In this case, (1210.71 - 1134.20) / 1134.20.
In this case the change is a 6.7457% increase.
you ask someone
You cannot. The starting value must be positive for a percentage change to make sense.
devide 9 by 12
You do not. Percentage change (increase or decrease) makes sense only if both numbers are positive or both are negative. Consider the change from -50 to +50. You could calculate the percentage change as 100*(new-old)/old = -200% Now consider the percentage change from +50 to -50. -200% again! So, in percentage terms a change from +50 to -50 is the same as from -50 to +50.
Real GDP/Capita
You calculate the change in percentage points. Thus, the change from -5% to 7% is a change (increase) of 12 percentage points.Do not try to calculate it as a percentage change. The change from -50 to 50 is 100*100/(-50) works out as -200% while the change from 50 to -50 is 100*(-100)/50 = -200%. One goes up, the other goes down but the % change is the same!
you ask someone
Do not calculate percentage changes when the numbers are negative since they are extremely difficult to interpret. The change from +100 to -100 is -200% The change from -100 to +100 is also -200%. The percentage changes are the same but the underlying change is completely different.
You cannot. The starting value must be positive for a percentage change to make sense.
(B-A)/A * 100
devide 9 by 12
You do not. Percentage change (increase or decrease) makes sense only if both numbers are positive or both are negative. Consider the change from -50 to +50. You could calculate the percentage change as 100*(new-old)/old = -200% Now consider the percentage change from +50 to -50. -200% again! So, in percentage terms a change from +50 to -50 is the same as from -50 to +50.
Percentage change in QD = (QD2 - QD1) / QD1 For Example: QD1 = 100 QD2 = 120 then % change in QD = .2 or 20%
Real GDP/Capita
The answer may depend on why the measurement is changing.
They use percentage change because of the nature of the unit being described. The elasticity of demand specifies how much percentage demanded changes in response to a 1% increase in price.
They use percentage change because of the nature of the unit being described. The elasticity of demand specifies how much percentage demanded changes in response to a 1% increase in price.