3.71% is the change from 485 to 503
Calculation steps:
[( 503 - 485 ) ÷ 485] x 100 = 3.71%
Formula
Percentage change = [(503 - 485) / 485] x 100
Subtract the new number by the original number
503 - 485 = 18
18 ÷ 485 = 0.03711340206185567
0.03711340206185567 x 100 = 3.71%