-98.55% is the change from 828 to 12
Calculation steps:
[( 12 - 828 ) ÷ 828] x 100 = -98.55%
Formula
Percentage change = [(12 - 828) / 828] x 100
Subtract the new number by the original number
12 - 828 = -816
-816 ÷ 828 = -0.9855072463768116
-0.9855072463768116 x 100 = -98.55%