-6.27% is the change from 830 to 778
Calculation steps:
[( 778 - 830 ) ÷ 830] x 100 = -6.27%
Formula
Percentage change = [(778 - 830) / 830] x 100
Subtract the new number by the original number
778 - 830 = -52
-52 ÷ 830 = -0.06265060240963856
-0.06265060240963856 x 100 = -6.27%