-82.22% is the change from 450 to 80
Calculation steps:
[( 80 - 450 ) ÷ 450] x 100 = -82.22%
Formula
Percentage change = [(80 - 450) / 450] x 100
Subtract the new number by the original number
80 - 450 = -370
-370 ÷ 450 = -0.8222222222222222
-0.8222222222222222 x 100 = -82.22%