-50% is the change from 908 to 454
Calculation steps:
[( 454 - 908 ) ÷ 908] x 100 = -50%
Formula
Percentage change = [(454 - 908) / 908] x 100
Subtract the new number by the original number
454 - 908 = -454
-454 ÷ 908 = -0.5
-0.5 x 100 = -50%
Example