61.23% is the change from 503 to 811
Calculation steps:
[( 811 - 503 ) ÷ 503] x 100 = 61.23%
Formula
Percentage change = [(811 - 503) / 503] x 100
Subtract the new number by the original number
811 - 503 = 308
308 ÷ 503 = 0.6123260437375746
0.6123260437375746 x 100 = 61.23%