63.62% is the change from 503 to 823
Calculation steps:
[( 823 - 503 ) ÷ 503] x 100 = 63.62%
Formula
Percentage change = [(823 - 503) / 503] x 100
Subtract the new number by the original number
823 - 503 = 320
320 ÷ 503 = 0.6361829025844931
0.6361829025844931 x 100 = 63.62%