-49% is the change from 502 to 256
Calculation steps:
[( 256 - 502 ) ÷ 502] x 100 = -49%
Formula
Percentage change = [(256 - 502) / 502] x 100
Subtract the new number by the original number
256 - 502 = -246
-246 ÷ 502 = -0.4900398406374502
-0.4900398406374502 x 100 = -49%