20.84% is the change from 643 to 777
Calculation steps:
[( 777 - 643 ) ÷ 643] x 100 = 20.84%
Formula
Percentage change = [(777 - 643) / 643] x 100
Subtract the new number by the original number
777 - 643 = 134
134 ÷ 643 = 0.208398133748056
0.208398133748056 x 100 = 20.84%