-81.56% is the change from 450 to 83
Calculation steps:
[( 83 - 450 ) ÷ 450] x 100 = -81.56%
Formula
Percentage change = [(83 - 450) / 450] x 100
Subtract the new number by the original number
83 - 450 = -367
-367 ÷ 450 = -0.8155555555555556
-0.8155555555555556 x 100 = -81.56%