-38.16% is the change from 828 to 512
Calculation steps:
[( 512 - 828 ) ÷ 828] x 100 = -38.16%
Formula
Percentage change = [(512 - 828) / 828] x 100
Subtract the new number by the original number
512 - 828 = -316
-316 ÷ 828 = -0.38164251207729466
-0.38164251207729466 x 100 = -38.16%