-41.15% is the change from 870 to 512
Calculation steps:
[( 512 - 870 ) ÷ 870] x 100 = -41.15%
Formula
Percentage change = [(512 - 870) / 870] x 100
Subtract the new number by the original number
512 - 870 = -358
-358 ÷ 870 = -0.4114942528735632
-0.4114942528735632 x 100 = -41.15%