-6.86% is the change from 875 to 815
Calculation steps:
[( 815 - 875 ) ÷ 875] x 100 = -6.86%
Formula
Percentage change = [(815 - 875) / 875] x 100
Subtract the new number by the original number
815 - 875 = -60
-60 ÷ 875 = -0.06857142857142857
-0.06857142857142857 x 100 = -6.86%