18.82% is the change from 643 to 764
Calculation steps:
[( 764 - 643 ) ÷ 643] x 100 = 18.82%
Formula
Percentage change = [(764 - 643) / 643] x 100
Subtract the new number by the original number
764 - 643 = 121
121 ÷ 643 = 0.18818040435458788
0.18818040435458788 x 100 = 18.82%