7.8% is the change from 641 to 691
Calculation steps:
[( 691 - 641 ) ÷ 641] x 100 = 7.8%
Formula
Percentage change = [(691 - 641) / 641] x 100
Subtract the new number by the original number
691 - 641 = 50
50 ÷ 641 = 0.078003120124805
0.078003120124805 x 100 = 7.8%