31.67% is the change from 502 to 661
Calculation steps:
[( 661 - 502 ) ÷ 502] x 100 = 31.67%
Formula
Percentage change = [(661 - 502) / 502] x 100
Subtract the new number by the original number
661 - 502 = 159
159 ÷ 502 = 0.31673306772908366
0.31673306772908366 x 100 = 31.67%