-96% is the change from 450 to 18
Calculation steps:
[( 18 - 450 ) ÷ 450] x 100 = -96%
Formula
Percentage change = [(18 - 450) / 450] x 100
Subtract the new number by the original number
18 - 450 = -432
-432 ÷ 450 = -0.96
-0.96 x 100 = -96%
Example