-18.12% is the change from 828 to 678
Calculation steps:
[( 678 - 828 ) ÷ 828] x 100 = -18.12%
Formula
Percentage change = [(678 - 828) / 828] x 100
Subtract the new number by the original number
678 - 828 = -150
-150 ÷ 828 = -0.18115942028985507
-0.18115942028985507 x 100 = -18.12%