31.15% is the change from 504 to 661
Calculation steps:
[( 661 - 504 ) ÷ 504] x 100 = 31.15%
Formula
Percentage change = [(661 - 504) / 504] x 100
Subtract the new number by the original number
661 - 504 = 157
157 ÷ 504 = 0.3115079365079365
0.3115079365079365 x 100 = 31.15%