-87.7% is the change from 829 to 102
Calculation steps:
[( 102 - 829 ) ÷ 829] x 100 = -87.7%
Formula
Percentage change = [(102 - 829) / 829] x 100
Subtract the new number by the original number
102 - 829 = -727
-727 ÷ 829 = -0.8769601930036188
-0.8769601930036188 x 100 = -87.7%