-51.23% is the change from 527 to 257
Calculation steps:
[( 257 - 527 ) ÷ 527] x 100 = -51.23%
Formula
Percentage change = [(257 - 527) / 527] x 100
Subtract the new number by the original number
257 - 527 = -270
-270 ÷ 527 = -0.5123339658444023
-0.5123339658444023 x 100 = -51.23%