-97.83% is the change from 828 to 18
Calculation steps:
[( 18 - 828 ) ÷ 828] x 100 = -97.83%
Formula
Percentage change = [(18 - 828) / 828] x 100
Subtract the new number by the original number
18 - 828 = -810
-810 ÷ 828 = -0.9782608695652174
-0.9782608695652174 x 100 = -97.83%