51.66% is the change from 331 to 502
Calculation steps:
[( 502 - 331 ) ÷ 331] x 100 = 51.66%
Formula
Percentage change = [(502 - 331) / 331] x 100
Subtract the new number by the original number
502 - 331 = 171
171 ÷ 331 = 0.5166163141993958
0.5166163141993958 x 100 = 51.66%