81.13% is the change from 424 to 768
Calculation steps:
[( 768 - 424 ) ÷ 424] x 100 = 81.13%
Formula
Percentage change = [(768 - 424) / 424] x 100
Subtract the new number by the original number
768 - 424 = 344
344 ÷ 424 = 0.8113207547169812
0.8113207547169812 x 100 = 81.13%