-49.54% is the change from 870 to 439
Calculation steps:
[( 439 - 870 ) ÷ 870] x 100 = -49.54%
Formula
Percentage change = [(439 - 870) / 870] x 100
Subtract the new number by the original number
439 - 870 = -431
-431 ÷ 870 = -0.4954022988505747
-0.4954022988505747 x 100 = -49.54%