-38.41% is the change from 828 to 510
Calculation steps:
[( 510 - 828 ) ÷ 828] x 100 = -38.41%
Formula
Percentage change = [(510 - 828) / 828] x 100
Subtract the new number by the original number
510 - 828 = -318
-318 ÷ 828 = -0.38405797101449274
-0.38405797101449274 x 100 = -38.41%