-7% is the change from 828 to 770
Calculation steps:
[( 770 - 828 ) ÷ 828] x 100 = -7%
Formula
Percentage change = [(770 - 828) / 828] x 100
Subtract the new number by the original number
770 - 828 = -58
-58 ÷ 828 = -0.07004830917874397
-0.07004830917874397 x 100 = -7%