-74.06% is the change from 320 to 83
Calculation steps:
[( 83 - 320 ) ÷ 320] x 100 = -74.06%
Formula
Percentage change = [(83 - 320) / 320] x 100
Subtract the new number by the original number
83 - 320 = -237
-237 ÷ 320 = -0.740625
-0.740625 x 100 = -74.06%