-66.18% is the change from 828 to 280
Calculation steps:
[( 280 - 828 ) ÷ 828] x 100 = -66.18%
Formula
Percentage change = [(280 - 828) / 828] x 100
Subtract the new number by the original number
280 - 828 = -548
-548 ÷ 828 = -0.6618357487922706
-0.6618357487922706 x 100 = -66.18%