-5.06% is the change from 830 to 788
Calculation steps:
[( 788 - 830 ) ÷ 830] x 100 = -5.06%
Formula
Percentage change = [(788 - 830) / 830] x 100
Subtract the new number by the original number
788 - 830 = -42
-42 ÷ 830 = -0.05060240963855422
-0.05060240963855422 x 100 = -5.06%