-1.27% is the change from 790 to 780
Calculation steps:
[( 780 - 790 ) ÷ 790] x 100 = -1.27%
Formula
Percentage change = [(780 - 790) / 790] x 100
Subtract the new number by the original number
780 - 790 = -10
-10 ÷ 790 = -0.012658227848101266
-0.012658227848101266 x 100 = -1.27%