-93.33% is the change from 450 to 30
Calculation steps:
[( 30 - 450 ) ÷ 450] x 100 = -93.33%
Formula
Percentage change = [(30 - 450) / 450] x 100
Subtract the new number by the original number
30 - 450 = -420
-420 ÷ 450 = -0.9333333333333333
-0.9333333333333333 x 100 = -93.33%