-51.25% is the change from 521 to 254
Calculation steps:
[( 254 - 521 ) ÷ 521] x 100 = -51.25%
Formula
Percentage change = [(254 - 521) / 521] x 100
Subtract the new number by the original number
254 - 521 = -267
-267 ÷ 521 = -0.5124760076775432
-0.5124760076775432 x 100 = -51.25%