-89.98% is the change from 828 to 83
Calculation steps:
[( 83 - 828 ) ÷ 828] x 100 = -89.98%
Formula
Percentage change = [(83 - 828) / 828] x 100
Subtract the new number by the original number
83 - 828 = -745
-745 ÷ 828 = -0.8997584541062802
-0.8997584541062802 x 100 = -89.98%