-47.86% is the change from 491 to 256
Calculation steps:
[( 256 - 491 ) ÷ 491] x 100 = -47.86%
Formula
Percentage change = [(256 - 491) / 491] x 100
Subtract the new number by the original number
256 - 491 = -235
-235 ÷ 491 = -0.4786150712830957
-0.4786150712830957 x 100 = -47.86%