23.26% is the change from 503 to 620
Calculation steps:
[( 620 - 503 ) ÷ 503] x 100 = 23.26%
Formula
Percentage change = [(620 - 503) / 503] x 100
Subtract the new number by the original number
620 - 503 = 117
117 ÷ 503 = 0.23260437375745527
0.23260437375745527 x 100 = 23.26%