-50% is the change from 478 to 239
Calculation steps:
[( 239 - 478 ) ÷ 478] x 100 = -50%
Formula
Percentage change = [(239 - 478) / 478] x 100
Subtract the new number by the original number
239 - 478 = -239
-239 ÷ 478 = -0.5
-0.5 x 100 = -50%
Example