-85% is the change from 900 to 135
Calculation steps:
[( 135 - 900 ) ÷ 900] x 100 = -85%
Formula
Percentage change = [(135 - 900) / 900] x 100
Subtract the new number by the original number
135 - 900 = -765
-765 ÷ 900 = -0.85
-0.85 x 100 = -85%
Example