-50% is the change from 872 to 436
Calculation steps:
[( 436 - 872 ) ÷ 872] x 100 = -50%
Formula
Percentage change = [(436 - 872) / 872] x 100
Subtract the new number by the original number
436 - 872 = -436
-436 ÷ 872 = -0.5
-0.5 x 100 = -50%
Example