-59.69% is the change from 320 to 129
Calculation steps:
[( 129 - 320 ) ÷ 320] x 100 = -59.69%
Formula
Percentage change = [(129 - 320) / 320] x 100
Subtract the new number by the original number
129 - 320 = -191
-191 ÷ 320 = -0.596875
-0.596875 x 100 = -59.69%