-80% is the change from 610 to 122
Calculation steps:
[( 122 - 610 ) ÷ 610] x 100 = -80%
Formula
Percentage change = [(122 - 610) / 610] x 100
Subtract the new number by the original number
122 - 610 = -488
-488 ÷ 610 = -0.8
-0.8 x 100 = -80%
Example