-6.87% is the change from 830 to 773
Calculation steps:
[( 773 - 830 ) ÷ 830] x 100 = -6.87%
Formula
Percentage change = [(773 - 830) / 830] x 100
Subtract the new number by the original number
773 - 830 = -57
-57 ÷ 830 = -0.06867469879518072
-0.06867469879518072 x 100 = -6.87%