-80% is the change from 600 to 120
Calculation steps:
[( 120 - 600 ) ÷ 600] x 100 = -80%
Formula
Percentage change = [(120 - 600) / 600] x 100
Subtract the new number by the original number
120 - 600 = -480
-480 ÷ 600 = -0.8
-0.8 x 100 = -80%
Example