-81.98% is the change from 666 to 120
Calculation steps:
[( 120 - 666 ) ÷ 666] x 100 = -81.98%
Formula
Percentage change = [(120 - 666) / 666] x 100
Subtract the new number by the original number
120 - 666 = -546
-546 ÷ 666 = -0.8198198198198198
-0.8198198198198198 x 100 = -81.98%