-48.92% is the change from 511 to 261
Calculation steps:
[( 261 - 511 ) ÷ 511] x 100 = -48.92%
Formula
Percentage change = [(261 - 511) / 511] x 100
Subtract the new number by the original number
261 - 511 = -250
-250 ÷ 511 = -0.4892367906066536
-0.4892367906066536 x 100 = -48.92%