21.46% is the change from 643 to 781
Calculation steps:
[( 781 - 643 ) ÷ 643] x 100 = 21.46%
Formula
Percentage change = [(781 - 643) / 643] x 100
Subtract the new number by the original number
781 - 643 = 138
138 ÷ 643 = 0.21461897356143078
0.21461897356143078 x 100 = 21.46%