30.1% is the change from 505 to 657
Calculation steps:
[( 657 - 505 ) ÷ 505] x 100 = 30.1%
Formula
Percentage change = [(657 - 505) / 505] x 100
Subtract the new number by the original number
657 - 505 = 152
152 ÷ 505 = 0.300990099009901
0.300990099009901 x 100 = 30.1%