-38.29% is the change from 828 to 511
Calculation steps:
[( 511 - 828 ) ÷ 828] x 100 = -38.29%
Formula
Percentage change = [(511 - 828) / 828] x 100
Subtract the new number by the original number
511 - 828 = -317
-317 ÷ 828 = -0.3828502415458937
-0.3828502415458937 x 100 = -38.29%