-6.88% is the change from 828 to 771
Calculation steps:
[( 771 - 828 ) ÷ 828] x 100 = -6.88%
Formula
Percentage change = [(771 - 828) / 828] x 100
Subtract the new number by the original number
771 - 828 = -57
-57 ÷ 828 = -0.06884057971014493
-0.06884057971014493 x 100 = -6.88%