you ask someone
You cannot. The starting value must be positive for a percentage change to make sense.
devide 9 by 12
To calculate the percentage of money, you divide the specific amount you want to find the percentage of by the total amount, and then multiply the result by 100. The formula is: ( \text{Percentage} = \left( \frac{\text{Part}}{\text{Total}} \right) \times 100 ). For example, if you want to find what percentage $20 is of $200, you would calculate ( \left( \frac{20}{200} \right) \times 100 = 10% ).
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!
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
To calculate the percentage of money, you divide the specific amount you want to find the percentage of by the total amount, and then multiply the result by 100. The formula is: ( \text{Percentage} = \left( \frac{\text{Part}}{\text{Total}} \right) \times 100 ). For example, if you want to find what percentage $20 is of $200, you would calculate ( \left( \frac{20}{200} \right) \times 100 = 10% ).
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%
This is a problem that people face every day. If you spent 10% of your money on food last year and 20% of your money on food this year, how much did your spending on food increase as a percentage of your money? You solve this problem the same way you find any other change percentage: subtract the old value from the new value and divide that number by the old value. So, (20%-10%)/10% = 100%. The percentage of your money that you spend on food has increased 100% over last year.
To calculate the money factor on a lease, you can convert the annual percentage rate (APR) to a decimal and divide it by 2400. This will give you the money factor, which is used to determine the finance charge on a lease.
Real GDP/Capita
The answer may depend on why the measurement is changing.