-91.26% is the change from 870 to 76
Calculation steps:
[( 76 - 870 ) ÷ 870] x 100 = -91.26%
Formula
Percentage change = [(76 - 870) / 870] x 100
Subtract the new number by the original number
76 - 870 = -794
-794 ÷ 870 = -0.9126436781609195
-0.9126436781609195 x 100 = -91.26%