-47.49% is the change from 478 to 251
Calculation steps:
[( 251 - 478 ) ÷ 478] x 100 = -47.49%
Formula
Percentage change = [(251 - 478) / 478] x 100
Subtract the new number by the original number
251 - 478 = -227
-227 ÷ 478 = -0.47489539748953974
-0.47489539748953974 x 100 = -47.49%