-41.72% is the change from 870 to 507
Calculation steps:
[( 507 - 870 ) ÷ 870] x 100 = -41.72%
Formula
Percentage change = [(507 - 870) / 870] x 100
Subtract the new number by the original number
507 - 870 = -363
-363 ÷ 870 = -0.41724137931034483
-0.41724137931034483 x 100 = -41.72%