101.57% is the change from 319 to 643
Calculation steps:
[( 643 - 319 ) ÷ 319] x 100 = 101.57%
Formula
Percentage change = [(643 - 319) / 319] x 100
Subtract the new number by the original number
643 - 319 = 324
324 ÷ 319 = 1.0156739811912225
1.0156739811912225 x 100 = 101.57%