3.5% is the change from 486 to 503
Calculation steps:
[( 503 - 486 ) ÷ 486] x 100 = 3.5%
Formula
Percentage change = [(503 - 486) / 486] x 100
Subtract the new number by the original number
503 - 486 = 17
17 ÷ 486 = 0.03497942386831276
0.03497942386831276 x 100 = 3.5%