28.09% is the change from 502 to 643
Calculation steps:
[( 643 - 502 ) ÷ 502] x 100 = 28.09%
Formula
Percentage change = [(643 - 502) / 502] x 100
Subtract the new number by the original number
643 - 502 = 141
141 ÷ 502 = 0.28087649402390436
0.28087649402390436 x 100 = 28.09%