-41.84% is the change from 870 to 506
Calculation steps:
[( 506 - 870 ) ÷ 870] x 100 = -41.84%
Formula
Percentage change = [(506 - 870) / 870] x 100
Subtract the new number by the original number
506 - 870 = -364
-364 ÷ 870 = -0.41839080459770117
-0.41839080459770117 x 100 = -41.84%