-87.78% is the change from 450 to 55
Calculation steps:
[( 55 - 450 ) ÷ 450] x 100 = -87.78%
Formula
Percentage change = [(55 - 450) / 450] x 100
Subtract the new number by the original number
55 - 450 = -395
-395 ÷ 450 = -0.8777777777777778
-0.8777777777777778 x 100 = -87.78%