-78% is the change from 900 to 198
Calculation steps:
[( 198 - 900 ) ÷ 900] x 100 = -78%
Formula
Percentage change = [(198 - 900) / 900] x 100
Subtract the new number by the original number
198 - 900 = -702
-702 ÷ 900 = -0.78
-0.78 x 100 = -78%
Example