65.21% is the change from 503 to 831
Calculation steps:
[( 831 - 503 ) ÷ 503] x 100 = 65.21%
Formula
Percentage change = [(831 - 503) / 503] x 100
Subtract the new number by the original number
831 - 503 = 328
328 ÷ 503 = 0.6520874751491054
0.6520874751491054 x 100 = 65.21%