-42.53% is the change from 870 to 500
Calculation steps:
[( 500 - 870 ) ÷ 870] x 100 = -42.53%
Formula
Percentage change = [(500 - 870) / 870] x 100
Subtract the new number by the original number
500 - 870 = -370
-370 ÷ 870 = -0.42528735632183906
-0.42528735632183906 x 100 = -42.53%