63.94% is the change from 502 to 823
Calculation steps:
[( 823 - 502 ) ÷ 502] x 100 = 63.94%
Formula
Percentage change = [(823 - 502) / 502] x 100
Subtract the new number by the original number
823 - 502 = 321
321 ÷ 502 = 0.6394422310756972
0.6394422310756972 x 100 = 63.94%