-48.27% is the change from 491 to 254
Calculation steps:
[( 254 - 491 ) ÷ 491] x 100 = -48.27%
Formula
Percentage change = [(254 - 491) / 491] x 100
Subtract the new number by the original number
254 - 491 = -237
-237 ÷ 491 = -0.48268839103869654
-0.48268839103869654 x 100 = -48.27%