-49.8% is the change from 506 to 254
Calculation steps:
[( 254 - 506 ) ÷ 506] x 100 = -49.8%
Formula
Percentage change = [(254 - 506) / 506] x 100
Subtract the new number by the original number
254 - 506 = -252
-252 ÷ 506 = -0.4980237154150198
-0.4980237154150198 x 100 = -49.8%