-98% is the change from 450 to 9
Calculation steps:
[( 9 - 450 ) ÷ 450] x 100 = -98%
Formula
Percentage change = [(9 - 450) / 450] x 100
Subtract the new number by the original number
9 - 450 = -441
-441 ÷ 450 = -0.98
-0.98 x 100 = -98%
Example