15.4% is the change from 500 to 577
Calculation steps:
[( 577 - 500 ) ÷ 500] x 100 = 15.4%
Formula
Percentage change = [(577 - 500) / 500] x 100
Subtract the new number by the original number
577 - 500 = 77
77 ÷ 500 = 0.154
0.154 x 100 = 15.4%
Example