-50.88% is the change from 509 to 250
Calculation steps:
[( 250 - 509 ) ÷ 509] x 100 = -50.88%
Formula
Percentage change = [(250 - 509) / 509] x 100
Subtract the new number by the original number
250 - 509 = -259
-259 ÷ 509 = -0.5088408644400786
-0.5088408644400786 x 100 = -50.88%