-89.24% is the change from 511 to 55
Calculation steps:
[( 55 - 511 ) ÷ 511] x 100 = -89.24%
Formula
Percentage change = [(55 - 511) / 511] x 100
Subtract the new number by the original number
55 - 511 = -456
-456 ÷ 511 = -0.8923679060665362
-0.8923679060665362 x 100 = -89.24%