-87.86% is the change from 824 to 100
Calculation steps:
[( 100 - 824 ) ÷ 824] x 100 = -87.86%
Formula
Percentage change = [(100 - 824) / 824] x 100
Subtract the new number by the original number
100 - 824 = -724
-724 ÷ 824 = -0.8786407766990292
-0.8786407766990292 x 100 = -87.86%