-50% is the change from 356 to 178
Calculation steps:
[( 178 - 356 ) ÷ 356] x 100 = -50%
Formula
Percentage change = [(178 - 356) / 356] x 100
Subtract the new number by the original number
178 - 356 = -178
-178 ÷ 356 = -0.5
-0.5 x 100 = -50%
Example