Simply multiply by 100: 200 x 100 = 20,000%
191/200 * 100% = 95.5%.
This is a 40% decrease.
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 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!
200% increase.
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 of 200 = 20000%
percentage of 200 = 20000%200 * 100% = 20000%
percentage of 200 = 20000%200 * 100% = 20000%
24 as a percentage of 200 is 12%
200 out of 500 as a percentage is 40%.
50 out of 200 as a percentage is 25%.