64.55% is the change from 505 to 831
Calculation steps:
[( 831 - 505 ) ÷ 505] x 100 = 64.55%
Formula
Percentage change = [(831 - 505) / 505] x 100
Subtract the new number by the original number
831 - 505 = 326
326 ÷ 505 = 0.6455445544554456
0.6455445544554456 x 100 = 64.55%