100.31% is the change from 321 to 643
Calculation steps:
[( 643 - 321 ) ÷ 321] x 100 = 100.31%
Formula
Percentage change = [(643 - 321) / 321] x 100
Subtract the new number by the original number
643 - 321 = 322
322 ÷ 321 = 1.0031152647975077
1.0031152647975077 x 100 = 100.31%