-52.78% is the change from 828 to 391
Calculation steps:
[( 391 - 828 ) ÷ 828] x 100 = -52.78%
Formula
Percentage change = [(391 - 828) / 828] x 100
Subtract the new number by the original number
391 - 828 = -437
-437 ÷ 828 = -0.5277777777777778
-0.5277777777777778 x 100 = -52.78%