30.88% is the change from 502 to 657
Calculation steps:
[( 657 - 502 ) ÷ 502] x 100 = 30.88%
Formula
Percentage change = [(657 - 502) / 502] x 100
Subtract the new number by the original number
657 - 502 = 155
155 ÷ 502 = 0.30876494023904383
0.30876494023904383 x 100 = 30.88%