-87.91% is the change from 455 to 55
Calculation steps:
[( 55 - 455 ) ÷ 455] x 100 = -87.91%
Formula
Percentage change = [(55 - 455) / 455] x 100
Subtract the new number by the original number
55 - 455 = -400
-400 ÷ 455 = -0.8791208791208791
-0.8791208791208791 x 100 = -87.91%