-38.89% is the change from 828 to 506
Calculation steps:
[( 506 - 828 ) ÷ 828] x 100 = -38.89%
Formula
Percentage change = [(506 - 828) / 828] x 100
Subtract the new number by the original number
506 - 828 = -322
-322 ÷ 828 = -0.3888888888888889
-0.3888888888888889 x 100 = -38.89%