7.57% is the change from 502 to 540
Calculation steps:
[( 540 - 502 ) ÷ 502] x 100 = 7.57%
Formula
Percentage change = [(540 - 502) / 502] x 100
Subtract the new number by the original number
540 - 502 = 38
38 ÷ 502 = 0.07569721115537849
0.07569721115537849 x 100 = 7.57%