-81.95% is the change from 665 to 120
Calculation steps:
[( 120 - 665 ) ÷ 665] x 100 = -81.95%
Formula
Percentage change = [(120 - 665) / 665] x 100
Subtract the new number by the original number
120 - 665 = -545
-545 ÷ 665 = -0.8195488721804511
-0.8195488721804511 x 100 = -81.95%