-49.3% is the change from 501 to 254
Calculation steps:
[( 254 - 501 ) ÷ 501] x 100 = -49.3%
Formula
Percentage change = [(254 - 501) / 501] x 100
Subtract the new number by the original number
254 - 501 = -247
-247 ÷ 501 = -0.4930139720558882
-0.4930139720558882 x 100 = -49.3%