-81.93% is the change from 664 to 120
Calculation steps:
[( 120 - 664 ) ÷ 664] x 100 = -81.93%
Formula
Percentage change = [(120 - 664) / 664] x 100
Subtract the new number by the original number
120 - 664 = -544
-544 ÷ 664 = -0.8192771084337349
-0.8192771084337349 x 100 = -81.93%