6.4% is the change from 781 to 831
Calculation steps:
[( 831 - 781 ) ÷ 781] x 100 = 6.4%
Formula
Percentage change = [(831 - 781) / 781] x 100
Subtract the new number by the original number
831 - 781 = 50
50 ÷ 781 = 0.06402048655569782
0.06402048655569782 x 100 = 6.4%