-41.52% is the change from 855 to 500
Calculation steps:
[( 500 - 855 ) ÷ 855] x 100 = -41.52%
Formula
Percentage change = [(500 - 855) / 855] x 100
Subtract the new number by the original number
500 - 855 = -355
-355 ÷ 855 = -0.4152046783625731
-0.4152046783625731 x 100 = -41.52%