-90.09% is the change from 545 to 54
Calculation steps:
[( 54 - 545 ) ÷ 545] x 100 = -90.09%
Formula
Percentage change = [(54 - 545) / 545] x 100
Subtract the new number by the original number
54 - 545 = -491
-491 ÷ 545 = -0.9009174311926605
-0.9009174311926605 x 100 = -90.09%