62.23% is the change from 503 to 816
Calculation steps:
[( 816 - 503 ) ÷ 503] x 100 = 62.23%
Formula
Percentage change = [(816 - 503) / 503] x 100
Subtract the new number by the original number
816 - 503 = 313
313 ÷ 503 = 0.6222664015904572
0.6222664015904572 x 100 = 62.23%