-81.21% is the change from 825 to 155
Calculation steps:
[( 155 - 825 ) ÷ 825] x 100 = -81.21%
Formula
Percentage change = [(155 - 825) / 825] x 100
Subtract the new number by the original number
155 - 825 = -670
-670 ÷ 825 = -0.8121212121212121
-0.8121212121212121 x 100 = -81.21%