-50.59% is the change from 506 to 250
Calculation steps:
[( 250 - 506 ) ÷ 506] x 100 = -50.59%
Formula
Percentage change = [(250 - 506) / 506] x 100
Subtract the new number by the original number
250 - 506 = -256
-256 ÷ 506 = -0.5059288537549407
-0.5059288537549407 x 100 = -50.59%