-62.68% is the change from 828 to 309
Calculation steps:
[( 309 - 828 ) ÷ 828] x 100 = -62.68%
Formula
Percentage change = [(309 - 828) / 828] x 100
Subtract the new number by the original number
309 - 828 = -519
-519 ÷ 828 = -0.6268115942028986
-0.6268115942028986 x 100 = -62.68%