31.74% is the change from 501 to 660
Calculation steps:
[( 660 - 501 ) ÷ 501] x 100 = 31.74%
Formula
Percentage change = [(660 - 501) / 501] x 100
Subtract the new number by the original number
660 - 501 = 159
159 ÷ 501 = 0.31736526946107785
0.31736526946107785 x 100 = 31.74%