-47.76% is the change from 490 to 256
Calculation steps:
[( 256 - 490 ) ÷ 490] x 100 = -47.76%
Formula
Percentage change = [(256 - 490) / 490] x 100
Subtract the new number by the original number
256 - 490 = -234
-234 ÷ 490 = -0.4775510204081633
-0.4775510204081633 x 100 = -47.76%