-89.44% is the change from 521 to 55
Calculation steps:
[( 55 - 521 ) ÷ 521] x 100 = -89.44%
Formula
Percentage change = [(55 - 521) / 521] x 100
Subtract the new number by the original number
55 - 521 = -466
-466 ÷ 521 = -0.8944337811900192
-0.8944337811900192 x 100 = -89.44%