-81.79% is the change from 670 to 122
Calculation steps:
[( 122 - 670 ) ÷ 670] x 100 = -81.79%
Formula
Percentage change = [(122 - 670) / 670] x 100
Subtract the new number by the original number
122 - 670 = -548
-548 ÷ 670 = -0.817910447761194
-0.817910447761194 x 100 = -81.79%