81.13% is the change from 355 to 643
Calculation steps:
[( 643 - 355 ) ÷ 355] x 100 = 81.13%
Formula
Percentage change = [(643 - 355) / 355] x 100
Subtract the new number by the original number
643 - 355 = 288
288 ÷ 355 = 0.8112676056338028
0.8112676056338028 x 100 = 81.13%